01-17-2007, 12:35 AM
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In using powerheads with reverse flow, a sponge filter acts both as a detrtitus filter and a bio filter. Yes, the gravel bed does act as a bio bed, but not in the traditional means. In traditional setup of the powerhead, the gravel bed serves two functions, (1) as a detritus trap and(2) as a bio bed for bacteria. The sponge filter is attatched to the intake side of the powerhead trapping particles before they are ingested by the pump. Water is then pumped beneath the filter plate. Air can be injected at this time to help provide your bacteria in the gravel with o2 by opening the venturi of the powerhead. The reverse current helps to keep most detritus suspended which is why I use multiple means of filtration. Only the heaviest particles fall to the bottom. You notice I said heaviest, not largest. By using multiple filtrations systems, water quality is better, water clarity is better. The fish are happier, I am happier. I truly have less upkeep. No weekly water changes, and, in most cases, no monthly water changes. The BIG tanks might get a water change semi annually.
Something many may not even consider here, any object in your tank, ei, decorations, stones, rocks, gravel, ect, is a part of your bio filter system.