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It sounds like he wants to only use the filter while stirring up detritus, not contantly. I agree the LF 150 works great with carbon, I have it on my tank. But for short term ( 1-2 days twice a month) to grab detritus I think sock filter would work. I believe he doesn't want to actually 'polish' the water, but rather justs wants to get built up detritus out when its stirred up.
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