The Planted Tank Forum - View Single Post - Filling an Eheim 2215 full of ATI hydro sponge
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post #3 of (permalink) Old 12-12-2012, 04:45 PM
Algae Beater
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Join Date: Jun 2011
Location: Vancouver, Canada
Posts: 358
there is exponentially more surface area on most bio-medis (substrat)

the issue with using sponges is that they are usually the first to fill with debris and thus slow down the filter. I would use sponge for the prefilter only
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