01-19-2011, 04:34 PM
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Its a pretty simple design. Basically there is an opening at each end of the tube, probably covered with screens. An air stone is placed at the bottom of the tube and the tube is filled with bioballs, or whatever biomedia you choose. When the air pump is turned on the bubbles draw water up over the bioballs. The idea is that the bioballs grow nitrafying bacteria just like a sponge filter.
As far as a recommendation on using it, I have never used anything like this. I will say that bacteria growth is all about surface area so I would think a sponge filter would be as effective as this if not more effective.
edit: I'm not sure what happened here. I was responding to a thread an now its gone?
PS. Sorry about that! Kym
Last edited by aunt kymmie; 01-19-2011 at 04:46 PM..