Syd Mitchell is a member of the Institute of Swimming Pool Engineers and has been designing and installing filtration systems and water quality control systems for swimming pools since 1984. Since becoming a koi keeper, he has been keen to pass on his accumulated knowledge to others by explaining the complex subject of water chemistry in simple everyday language.

The anoxic filtration system was design by Kevin Novak Ph.D. Full details have been published in his CD book, which can be obtained directly from him or read on-line at www.mankysanke.co.uk (click “anoxic filtration”).