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    Eheim Ehfisubstrat Biological Filtration Media

    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...
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