The Planted Tank Forum - View Single Post - Filling an Eheim 2215 full of ATI hydro sponge
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Old 12-12-2012, 04:45 PM   #3
Algae Beater
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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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