Biofilters are the difference between life and death for your fish ponds.

You need clean healthy water.

Summary from a chapter of "Your Pond: Crystal Clear Water Guaranteed" - One of the most fascinating parts of pond keeping for the enthusiast is the management of the pond water quality. - This filter does the job of removing solids and particles that remain suspended in the water, and if there is an automatic pool cleaner "kreepy krawley in South Africa" it also removes those solids that settle on the bottom. - In this way the water remains perfectly safe to swim in the because the chlorine kills all the harmful bacteria and sanitises the water. - That which is eaten by the fish is partly digested and partly expressed as a waste product, which sinks to the bottom of the pond. - At their simplest these biofilters are literally black or green boxes holding sponges, brushes or other means of trapping particles. - The boxes also contain plastic tubing often called Flocor, plastic balls, other weird plastic shapes or if you are lucky the boxes contain Alfagrog. - A biofilter first and foremost is designed to purify water and the secondary purpose is to remove the solids that make water cloudy. - Foam sheets by virtue of the many small holes in them also provide surface on which bacteria can grow as well as acting as a mechanical filter to remove solids. - By far the best means of getting large surface area into a small black box biofilter at low cost is to use porous ceramic materials like "Alfagrog". - metres per litre depending upon the particle size compared to 0.2 square metres per litre for plastic tubes.  

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copyright: 2002, this website and many others to do with water gardening and use of water in the home was created by Tony Roocroft who lives in Johannesburg South Africa