Cleaning and Maintenance for Your Home Waterfall Feature

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November/December 2009

John Olson

String algae can completely overwhelm an otherwise beautiful waterfall.

Few things in life are as soothing as the sound of running water. The calming effects of falling water have been enjoyed by mankind for thousands of years. Once the sole domain of the rich, recent advances in the technologies of water fall supplies and systems have brought this tranquil and relaxing pastime to tens of thousands of people.

Across America and the rest of the world, news weary people are ever more opting to take refuge from the world not in some foreign tourist spot, but beside a backyard stream or waterfall of their own creation. The rushing water, the sights and sounds that make waterfalls so popular, allow each of us to turn our own yards into a personal retreat from the cares of the world. With or without an adjoining pond, waterfall features can become an increasingly desirable spot for the entire family to picnic, party, and play.

Yet with more and more of these easy to install backyard waterfalls popping up across the nation I find one of the most frequently asked questions is about how to maintain and clean a waterfall feature. A quick search across the Internet provides a variety of products and a plethora of conflicting information. Below you will find practical advice on simple procedures and supplies that will help you keep your home waterfall clean, clear and the crown jewel of your landscaping project.

Let’s look at some of the basic waterfall maintenance and care questions and address them in an easy to understand manner.

My Backyard Waterfall keeps going dry, do I have a leak?

It is possible that you have a leak, but there are many other reasons why your waterfall may require you to add water frequently. Before assuming the worst, check your waterfall for the following:

  1. Is your waterfall facing the full afternoon sun? Evaporation may cause the loss of several gallons or several hundred gallons of water each day depending upon the size of your waterfall. Evaporation is extremely high in sunny dry climates, but affects almost all regions.

  2. Has it been extremely windy in your area lately? Wind, like sun, can cause huge losses of water from evaporation. A combination of the two can help dry up your water feature in a surprisingly short time.

  3. Does your waterfall have a large distance with free falling water? The higher the waterfall is, the more possibility of both evaporation and splashing. Splashing can also rob your waterfall of water. Check outside the stream or waterfall area for wet rocks, plants, or dirt. If your water is not staying in the waterfall this can be a big source of your problem.

  4. Do you have plants that extend over into the stream or waterfall that are partially diverting the flow of water from the feature? Once I had a wonderful Queen Fern that thrived so well its leaves actually grew under the falling water and were deflecting it outside of my waterfall liner.

After checking for the above, pare back any plants that are too big or growing too far into the waterfall feature. Splashing can be controlled by adjusting the rocks or gravel at the base of the waterfall. AFTER the waterfall feature is built, there is not much you can do to avoid sunlight or wind but you can make sure your waterfall is equipped with an automatic water fill valve. This inexpensive little item is attached inside the water basin and uses a float switch to automatically add water to your waterfall through a small hose whenever the level falls to low.

I checked all the above and still think I have a leak, what do I do?

Courtesy of Freddie Combas - Florida Water Gardens.

Before you tear apart your waterfall to track down that mysterious leak check the simple things first.

  1. Check the connection from the tubing to the waterfall filter or spillway. A poorly fitting connection or one that has worked loose could be spraying out water behind your waterfall

  2. Check the spillway itself and make sure water is not spilling out and going back behind the unit or under the pond liner.

  3. Check the tubing from the waterfall pump all the way to the spillway. The two most common types of tubing used in waterfalls are flexible spiral non kink tube or a flexible thick PVC tube. These tubes are very strong but if damage occurred during installation or the tube had a defect in it you could find that you are loosing water right into the ground where you have the tubing buried.

  4. With the waterfall off check the level of the water in the basin. Check it again the next day. If the water level has stayed the same then you have two possibilities (assuming you have checked the tube and the connection). The leak is in the waterfall or the stream itself or you are back to the evaporation problem previously covered.

  5. If the water in your basin has lowered while the waterfall is turned off then you very likely have a leak in your basin. I would allow the water to continue to leak out until it stops. The water level will drop only to the point of the leak and then stop. Once it stops you will have a much easier time finding and repairing the leak.

A leak in the basin made with EPDM pond liner is fairly easy to fix. You can purchase an EPDM repair kit from many retail stores in person or on line. These kits contain a primer, scrub pad and a section of EPDM patch material. A few hours later you will be ready to refill and once again enjoy your waterfall.

If the leak is not in your basin then unfortunately it is likely inside the waterfall lining itself. If you had the pond professionally installed this would be the time to call them out to inspect. They will most likely repeat many of the above steps before tearing down the rocks and waterfall itself. If you installed the waterfall on your own then you have a bit of work to do. The rocks in the stream and waterfall will need to be removed and the entire liner inspected for damage. Once found you may use the EPDM repair kit to fix.

If your waterfall is made of PVC, concrete or some other type of material you will need to research additional information on repairing these less common types of liners.

What is the best way to clean out leaves that have blown into my Stream or Waterfall?

Waterfalls and streams are home to many size rocks. These rocks create crevices that will often trap wind blown leaves. If you notice a few leaves here and there you can probably pick them out by hand. If you find a lot of leaves in your waterfall or stream it is important to remove them as they will decay and affect the quality of your water if you do not. The very best way to remove an abundance of leaves is to turn off the waterfall and allow the rocks and leaves to dry out. Once dry, a regular leaf blower is perfect to dislodge most trapped leaf matter. If you do not have a leaf blower try a stiff bristled broom. It may take a bit more elbow grease but you can get the job done.

I have green stuff growing on the rocks in my waterfall, How do I clean them?

Firsts let’s consider what your green stuff might be. Algae, moss, or Lichen are the three most likely suspects.

Moss is the most evolved of the three and in many varieties you can actually see leaf like structures which are not present with algae. Moss loves moist wet environments but does not grow in the water itself. If you have a thick green carpeting on your rocks but it does not extend far into the water itself you probably have moss.

Courtesy of Freddie Combas - Florida Water Gardens.

Some of the most beautiful waterfalls in the world have water cascading over moss covered rocks. The velvety texture and the varied green colors of many moss types add a colorful natural addition to a man made waterfall. Some people even pay to have moss added to their waterfalls and take great pride in growing such a wonderful highlight to their feature. If you feel that the moss adds beauty and makes a more natural looking waterfall you may wish to consider leaving it alone.

If you prefer to remove the moss you will want to physically remove as much of it as possible and then use one of the treatments discussed below. Turning the waterfall off and using a pressure cleaner is a great way to deep clean your rocks but you can simply lift or scrape off most moss.

Lichen is a symbiotic simple celled composite plant that requires both a fungus and algae to thrive. These organisms can cover the face of rocks, wood, and even soil itself. Lichens come in a variety of shapes, sizes and colors. They can survive long periods without water and have even been known to survive in the vacuum of space. Like moss, the lichen coverings on rocks surrounding waterfalls are generally sought after by the owner and left to add a touch of nature to the waterfall feature. If you decide to remove the lichen again physical removal is usually required followed by a treatment of algaecide or debris scrub described below.

Algae is the one basic celled plant that most pond and waterfall owners would just as soon do without. Most often the algae you find on waterfalls is known as string algae and if you have it you will understand the name. Long stringy fingers on this algae can grow up to 2 foot in length. The algae itself will not harm the water in any way but is mostly viewed as a nuisance.

If your waterfall is attached to a pond with fish you will have a much higher chance of having a problem with algae in your waterfall. Algae grows when an abundance of nutrients are present. The nutrients combined by energy from the sun allow algae to develop and thrive. The nutrients in the water typically come from fish waste and the ammonia and Nitrates they produce. If your waterfall is not hooked to a fish pond system then the algae has developed from decaying plant matter that has found its way into your waterfall system.

OK, I think it is algae that I have. How do I get rid of it?

Courtesy of Freddie Combas - Florida Water Gardens.

To eliminate string algae growth from your waterfall that has a pond you can use a variety of different methods.

  1. Physical removal is possible if you have the time and patience to do it. The use of a toilet brush or something similar will allow you to twist the string algae and wrap it up like spaghetti on a fork. A little time consuming but certainly effective.

  2. Remove the algae food source and the string algae will not thrive. The addition of beneficial bacteria to your fish pond will establish a colony of beneficial bacteria. This invisible Bacillus bacteria will thrive on the same excess nutrients that algae love to consume. If the pond bacteria is consuming enough of the nutrients then the algae will not thrive.

  3. Use an oxygen based debris scrub product to blast the algae off the surface of the rocks. These products abound on the market and all typically are based on a chemical called Sodium Percarbonate that is a white crystallized water-soluble combination of Sodium Carbonate and Hydrogen Peroxide. The Sodium Percarbonate is the primary ingredient in eco friendly bleaches, cleaners and teeth whitening systems.

Simply sprinkle the debris scrub material lightly over the effected area with the water turned off. Wait at least 8-12 hours before you resume the waterfall flow.

NOTE: If your waterfall is very large and covered with a lot of algae and attached to a pond that is very small you may need to treat half of it to start with. Once treated, wait two days before treating the other half. The debris scrub will use the power of oxygen to destroy the algae but the dead algae will go from producing oxygen to consuming oxygen as it dies. If too much algae dies at once it may be necessary to add extra aeration to the pond water with an air pump or fountain. Additionally the dead algae that ends up in your pond will become the source of nutrition for new algae to grow so be sure to add lots of beneficial bacteria to your pond in order to consume this dead matter before it can cause further problems.

  1. Use a solution of concentrated barley extract. Barley has been used by farmers for hundreds of years to prevent the growth of algae in their farm ponds. This method can work for waterfalls as well. The barley changes the water as it breaks down and makes it less suitable an environment for algae to grow in. Barley extracts are easily found in just about any pond related retail store.

  2. Use an EPA registered algaecide. Be very careful with any algaecides that contain copper as an ingredient if your waterfall or stream flows into a pond. The use of this type of product can kill your fish and plants. Algaecides come in many different types of liquids and powders. Even without copper an algaecide can harm your fish by removing oxygen from the pond and if too much algae dies at once you may need to add additional filtration by air pump or fountain until a new balance is achieved. The addition of beneficial bacteria to the pond is strongly recommended to reduce the chances of further problems.

Waterfalls Without Ponds

If your waterfall does not flow into a pond then you can easily use the above methods without damage to your fish. Just read the labels on any product that you purchase as some of the EPA registered algaecides will also contain ingredients that can harm any water plants you have in the waterfall.

What does EPA registered Algaecide really mean? Do I have to have one?

A product that is registered with the Environmental Protection Agency as an algaecide has been tested extensively to prove that claim. Generally EPA registered algaecides are specific chemical compounds that act in a way to kill algae.

You will find a great many products on the market that will help you maintain your pond and waterfall that are not EPA registered. These products often do things such as consume the same nutrients that algae would use to grow and thus preventing the algae from getting a foothold in your pond or waterfall.

Why are these other products not EPA registered?

Some products for use in ponds and waterfalls are not EPA registered because they do not kill or eliminate algae as an algaecide does with chemicals. Additionally many of these products are common chemicals or naturally occurring products such as barley extract and Bacillus bacteria that many manufacturers know about and offer for sale. An EPA registration can take hundreds of thousands of dollars and up to 10 years to complete. Once the registration is in place for that product ANYONE can use that registration to offer the same kind of product without going through all the work and money. No company wants to spend a quarter million dollars on registering a bale of barley! No company wants to make that kind of effort to register a naturally occurring bacteria when all of their competitors could immediately start using the registration as well without paying a penny.

It certainly makes finding suitable NATURAL pond products frustrating but these products are widely offered to the public and do not make any type of claim about eliminating algae.

NOTE: At the time of this article Sodium Percarbonate has received an EPA registration as an algaecide in the water treatment field under the name PAK 27 (registered Trade Mark). I expect to see this product widely offered as a debris scrub algaecide this next year.


Your waterfall can be an endless source of beauty and enjoyment to you and your family and friends. The work and time maintaining a backyard waterfall and stream are minimal but very important. By following the simple care tips above, you will keep your waterfall in pristine condition and ready for enjoyment at all times. Wishing you and your waterfall the very best!

John Olson

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POND Trade Author - John Olson

Author John Olson

Company Graystone Industries

Bio John Olson is the CEO of Graystone Industries and an avid alligator wrestler. Graystone is a distributor for over a dozen brands of quality pond supplies...

Read the full bio.



Problem seeking remedy. My tank that supplies water to my waterfall is filled with fresh water but overtime ground water mixed with mud seeps in causing a putrid stink in the water. The water smells rancid and the air smells of the water too when run. Is there any way to add fragrence or remove the bad smell? I would buy a product if it existed. Water does not mix with animals or plants so anything can be done to it. Brad

1. Posted on July 29th, 2010 at 11:37 am.

By Brad Romney.


If the waterfall reservoir has any type of filter in it then I would recommend that be changed to start with. The second suggestion would be to try any of the sodium percarbonate based products such as American Pond Debris scrub (and sold under countless other names). Sodium percarbonate is used in many water treatment facilities and is the primary ingredient of Oxy Clean laundry detergent booster. That should dramatically cut down any odors from organic decomposition. I would turn the water off, if possible, to start with and generously sprinkle the dry powder all over all surface areas and any standing water (it will sink). Wait a couple of hours and you should be able to start that right up. Best wishes for your waterfall and pond.

2. Posted on July 29th, 2010 at 4:49 pm.

By John Olson.


We have a beautiful waterfall that is in full sun most of the day. There is algae that grows on the rocks. I periodically shut down the waterfall and power-wash the rocks. We also have two small dogs that drink from the waterfall. What would you recommend to use to keep the water pristine and the algae down and not harm our pets?

3. Posted on August 14th, 2010 at 9:58 am.

By Mary.


Keeping your waterfall clean and safe for your pets is not complicated and should never require power washing. We offer a quick and easy pond debris (rock scrub) product (as do many other dealers) which can be viewed at

Use an oxygen based debris scrub product to blast the algae off the surface of the rocks. These products abound on the market and all typically are based on a chemical called Sodium Percarbonate that is a white crystallized water-soluble combination of Sodium Carbonate and Hydrogen Peroxide. The Sodium Percarbonate is the primary ingredient in eco friendly bleaches, cleaners and teeth whitening systems.

Simply sprinkle the debris scrub material lightly over the effected area with the water turned off. Wait at least 8-12 hours before you resume the waterfall flow.

4. Posted on August 15th, 2010 at 12:13 pm.

By John Olson of Graystone Creations.


I work at a Waterfall attraction in Jamaica. We presently use a "bass" broom to clean the algae/moss from the rock to prevent our guests from slipping and being injured. Is there an easier way that you can recommend?

5. Posted on September 11th, 2010 at 9:14 am.

By andrew mccarthy of enchanted gardens.



If the waterfall can be shut off or diverted from the area in question and product like American Pond Debris scrub (found at can be used to blast away the debris accumulation. It is available standard in 7 lb size but we offer larger containers at significantly reduced wholesale prices.

If the water cannot be diverted or shut off but runs mildly over the affected area you should still be able to use the debris scrub as the granules sink to the bottom to do their work and it can be used in water. It may take a little heavier application in this situation.

If the water cannot be stopped and it constantly moves quickly across the affected area then I am not aware of any treatment other than the physical method you currently employ.

Thanks for your question and I look forward to my next Jamaican vacation! We often climb the Duns River Falls when we are on the island.

John Olson, CEO
Graystone Industries, Inc.

6. Posted on September 14th, 2010 at 9:21 am.

By John Oloson of Graystone Industries, Inc..



I am having rubber decking material installed on the floor in the patio where I have a three-tiered concrete waterfall.

I used to use a drop of chlorine bleach in the waterfall to keep the water clean, but am concerned that if the bleached water splashes out of the waterfall it may discolor the rubber decking material. Any suggestions to keep the water in my waterfall crystal clean and clear? Thanks@

7. Posted on September 23rd, 2010 at 12:02 pm.

By Mary.



While a few drops of bleach mixed with many gallons of water is probably not going to cause any discoloration I suggest you contact the decking manufacturer to be on the safe side. Meanwhile there are several non bleach methods you can use. If the water in the fountain is green there are several liquid algaecides on the market for use in fountains and waterfall where there are no fish or plants.

If the rocks or concrete is the problem you may want to use a powder debris scrub such as American Pond Debris scrub available at

Best wishes for your waterfall,

John Olson, CEO
Graystone Industries, Inc.

8. Posted on October 1st, 2010 at 8:02 am.

By John Olson of Graystone Industries, Inc..


I want to know the best way to keep my waterfall from freezing over in the winter months. Can someone help me?

9. Posted on November 6th, 2010 at 2:45 pm.

By Phillip.



The water is unlikely to freeze in western TN down in your underground basin. Do not add any chemical to the water to prevent freezing as it will harm the liner and nearby animals.

Many people enjoy running their waterfalls when temp is freezing so that they can see the wonderful frozen shapes the ice makes on their waterfall rocks.

Be aware the lots of ice buildup could obstruct the flow of water coming over the spillway and you would need to clear that away if it happens. If you have a large ice build up you will also need to keep an eye on the water level to make sure you do not run dry.

The most drastic measure you could take to prevent ice on the waterfall would be the use of salt. Again I do not recommend this but it would be far better than anti freeze.



10. Posted on November 8th, 2010 at 6:09 pm.

By John Olson, CEO of Graystone Industries, Inc..


I have a 24 hour old waterfall that I built in my back yard. It was filled with county water (approx. 100 gal.) and I notice that it is getting cloudy. What do I need to stop the problems of funky water and algae?

11. Posted on June 9th, 2011 at 3:35 pm.

By Shannon.


The cloudy water is most likely due to the silt from the rocks and gravel in the system. There is no need to do anything as they will settle out in a day or two. If not please let me know

12. Posted on June 10th, 2011 at 5:58 am.

By John Olson of Grayston Industries, Inc..


Not a comment except the info is interesting. We built a 15' waterfall with multiple ridges. The pond loses about three inches per day, sometimes 5. There is another reciever pond on the top of the falls and a catch pond on the bottom. How much water will I lose from simple evaporation every day? Thanks.

13. Posted on August 6th, 2011 at 12:39 pm.

By Lynne Nolan of Rocks to Roses Landscaping.


A good general rule of thumb is that most water features will loose approximately 1 inch per week by evaporation.

But there are several other factors: weather, streams, waterfalls (the splash factor)...

So one inch is a rule of thumb then take into consideration the additional variables.

14. Posted on August 31st, 2011 at 12:48 pm.

By Cindy Graham.


Will a dose of bleach work to eliminate algae from my pond less waterfall? We do not have fish! Plants! Etc... Just lots of recurring algae strings in our 8 ft long waterfall.

15. Posted on September 5th, 2011 at 10:50 am.

By Reg.


Bleach is always a last resort for any type of algae treatment. The bleach will work its way into the pump and will dry out the seals on the pump. This leads to rapid failure of the pump and a greatly reduced lifespan.

If traditional methods are not to your liking you would be better to buy containers of hydrogen peroxide and pour them over the algae on the waterfall.


16. Posted on September 6th, 2011 at 5:34 pm.

By John Olson of Grayston Industies, Inc..


We bought a home with a small waterfall in the backyard here in southern Arizona. We will not be here for several months each summer. Is it best just to drain the pool by the waterfall and leave it dry during these summer months?

17. Posted on March 31st, 2012 at 12:02 pm.

By Ronald Hillegonds.


We recently had our pond(5,000 gal.) cleaned out by a company we have been dealing with for years. A day after the cleaning, fish began to die. We have never had this situation before. We called the company and they told us to put salt in the water. The fish were struggling for oxygen. We bought a small pump and have had it working in the pond for 24 hours. We've also noticed an increase in foam from the streams and are continuously removing algae from the skinner. Suggestions?

18. Posted on April 29th, 2012 at 10:29 am.

By Bill Dow.


Here is what caused the above question -

We finally got an answer. Our local water company came out and checked the quality of the water and the pH. Nothing there. We took a sample of the water, which left a reddish/brown foam in the skimmer, to a local lab that does well drilling. It was determined that the water contained a high amount of iron. Our pond guy came to the house and partially removed the water. He did check the filters. He removed the pump and discovered the cause of the problem. The pump, which was three years old, was covered with rust. The casing was made of stainless steel and plastic.

19. Posted on June 15th, 2012 at 11:56 am.

By Cindy of POND Trade Magazine.


We recently installed an indoor waterfall and it is emitting kind of a "swampy" odor. What is the best way to treat the water to avoid this from happening in the future?

20. Posted on January 5th, 2013 at 2:31 pm.

By Kristen.


We had a waterfall with a stream put in next to our patio. It has over time built up some kind of scum on the small rocks in the bottom and partially up the rocks on the sides where the water hits. We have been using a product that was recommended by a local pool company called HASA (chlorinating granules)once a week, but it has gradually become worse all the rocks that water touches now looks black. The water fall and stream gets some sun, however is partially shaded a part of the day. What can we do?

21. Posted on June 10th, 2013 at 8:57 am.

By nancy krieger.


I need help with what to use to get the "whitening" off the waterfall rocks that decorate the pool.


22. Posted on June 25th, 2013 at 4:57 pm.

By Lyn Shealy.


The tabs they are using are not having any effect other than leaving dead algae on the rock face. Use an oxygenating scrubbing clean such as American Pond Debris Scub, Green Vista Pond and Waterfall Cleaner or Green Clean. The first two are a higher concentrate of active ingredient but all will work. You would shut the waterfall off and sprinkle the powder over the face of the waterfall. In about half an hour you should rinse off the waterfall with a garden hose while trying to prevent the gunk from going back into the waterfall basin. (the dead algae will cause a foam for several days). You can then turn the waterfall back on and you will be all set.

For long term solution you can purchase an ionizer unit for the waterfall. They are fairly inexpensive and are available from Atlantic, Anjon, Pro Eco and other companies. This unit attaches in line to the tubing and releases copper ions that make it impossible for algae to grow in the water.

23. Posted on June 27th, 2013 at 10:53 pm.

By John Olson of Graystone Industries.


For a scaly white buildup the customer should test a small area with vinegar. If it cleans up with vinegar then it is simply lime or calcium buildup and they could clean the face of the waterfall that way. If it does not clean up with vinegar please feel free to let me know and we can explore other possibilities.

24. Posted on June 27th, 2013 at 10:55 pm.

By John Olson of Graystone Industries.


I set up a three tiered waterfall now there is rust forming in the tanks how can I get rid of this and prevent it from coming back.

25. Posted on June 29th, 2013 at 6:45 am.

By Deborah.


Not 100% sure what you mean by tanks on a three tiered waterfall. However, if no fish or plants are present she can shut the system down and add some CLR or LimeAway into each metal tank. If she does not have a metal tank then we are talking about something else entirely and I would need more information. The CLR or Limeaway can soak overnight and it should be pretty rust free the next day. Just follow instructions on the container of product and all should be well.
Best Wishes, John

26. Posted on July 17th, 2013 at 9:39 pm.

By John Olsen of Graystone Industries.


The rocks on my waterfall are covered with calcium. How do I clean that off?


Jim Novak

27. Posted on August 17th, 2013 at 11:33 am.

By Jim Novak.


My pondless waterfall has developed a nasty case of black mold on the rocks. Any suggestions on how to get rid of it? I've scrubbed it off the best I can but it's impossible to get all of it. All of the general products I've found are only to control green algae. They say nothing about black mold.


28. Posted on August 29th, 2013 at 4:10 pm.

By Scott.


Calcium deposits can be removed with vinegar. If it is a pondless waterfall you can treat as heavy as needed. With a fish filled pond you will want to spot treat and check the PH every few days while treating. If no fish are present you can also use a product called CLR or even Limeaway.

29. Posted on September 4th, 2013 at 11:21 pm.

By John Olson of Graystone Industried.


What appears as black mold is probably dead algae. The use of a product like American Pond Pond and waterfall cleaner or other powdered debris scrub cleaner will blast away the caked on gunk with the power of dissolved oxygen. Keep in mind that if you have fish the dead algae will become the food for the next generation of algae blooms unless you treat pond with bacteria to remove the excess nutrients.
- John Olson

30. Posted on September 4th, 2013 at 11:23 pm.

By John Olson of Graystone Industries.


Thanks John. It's good to know that you don't think it's actually black mold. I ordered some of the Pond and Waterfall cleaner and will give it a try.

31. Posted on September 17th, 2013 at 9:22 am.

By Scott.


We have a three tier water fall with pump and filter. Foam is forming on top of water, appears to be air bubbles at top tier, but form in white pudding like white scum at bottom pond. Water is clear. Any ideas what is happening. Never had this happen. Water is moving at higher volume through system because we remove debris from filter system

32. Posted on November 15th, 2013 at 4:17 pm.

By Bob Swinehart.


What a excellent waterfall preparation expanded here by giving the technical satisfaction of the pond position.Really its a parametrically cleaning surface position of the Concrete Curing Compound Manufacturer on the construction field.

33. Posted on November 26th, 2013 at 12:47 am.

By Concrete Curing Compound Manufacturer of


Foam can often form on a waterfall - especially after cleaning or making a volume change. The foam is caused by organic waste in the water that provide structure to air bubbles and then form into a mass. There are several home remedies you can try or you can purchase a professional defoaming agent from a pond supplier.

Waterfall owners often use a capful of fabric softener or a couple ounces of vinegar. They are known to help keep the bubbles from forming.

You can also physically remove the bubble mass. It may reform a few more times but the more material you physically remove the less that is there to cause the issue.


34. Posted on November 28th, 2013 at 11:30 am.

By john olsen of Graystone Industries.


Great article and comments!

35. Posted on January 28th, 2014 at 2:53 pm.

By Mark of Any Pond Limited.


I started putting about a cup of clorox once a month to get rid of the algae on the fountain. Prior to adding clorox, I was scrubbing the rock fountain with a wire brush. Now my beautiful fountain has a dark brown color, and the gray rocks around the fountain also have turned dark brown. The dark brown on the fountain will not come off when scrubbing with a wire brush. How can I get the natural rock color back.?

36. Posted on February 22nd, 2014 at 3:02 pm.

By Nancy.


Sadly, Other than professional pressure washing I know of no other way to remove the stains caused by the bleach reaction with the algae. The use of a debris scrub product like the one shown at the bottom of page may be of some help.

I would recommend treating the affected area with the rock wet (but not running water) and leaving it for about 20 min before using the scrub brush on it again. The dissolved oxygen should loosen some of the stain and help lift it off the rock.

37. Posted on February 24th, 2014 at 12:57 pm.

By John Olson of Graysone Industries.


I need clean a waterfall/cascade a and possible the filter
In Saratoga/ca.
Could you tell me if you have somebody around to do it ?

38. Posted on May 6th, 2014 at 11:13 am.

By Agenor Tonussi.

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