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Good thought Eco- didn't think about the crud being collected in the blue course media(sponge) would provide good filtering of the water before it hits the biomedia. No sense getting the biomedia messy. Gotta wonder about the LFS sometimes.:lol:

I have a 75 gal freshwater aquarium, and I use two Ehiem filters - a 2213 and a 2215. When I do a water change (about once a month), I clean one of the filters. Each filter has a mechanical filter (course blue sponge), the biological filters (ehfisubstrat) and then more mechanical filtering...