Details
Alfagrog Filter Media
Alfagrog is a Volcanic rock and has been used now for several years with a great deal of success .. it is very inert and soon colonises with beneficial bacteria ...
Alfagrog pond filter media has a very high surface area making it an ideal material on which micro organisms can adhere and boost biological decomposition of pollutants. It is made of a highly porous material that contains many thousands of tiny pockets in which bacteria can thrive making in an ideal material for biological filters
Its only draw back - sharp on the hands when cleaning ... so please wear gloves...
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