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It used as biological filter.t is less important to remove particles from water than it is to process nitrogen, so if there is to be a compromise between mechanical and biological, err on the side of biological. In other words, it is better to allow particles below a certain size to escape back into the pond and to convert a great deal of ammonia to nitrate, than it is to catch every little thing down to a micron or less and in the process slow the water down to the point where the bacteria have a hard time living. The bacteria that do this work for us are among a class of bacteria that we have all heard of before, they are the so-called, “nitrogen fixing” bacteria.
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