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The AST FIT 400 is an all in one system comprised of a fish tank, a built in filter, and a sludge basin. These filters continually backwash themselves, only requiring an operator to drain the sludge periodically. This keeps the nitrifying bacteria healthy, so the water stays clean and healthy for the fish. The sludge from the basin can be used as fertilizer, or diverted into an aquaponics system.
Learn more about the FIT system: astfilters.com...