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I've been using Poret foam "Walls" in my 20g sump on my 75g planted cichlid tank for a while now. 600+ gph flow through a 10ppi -> 20 ppi -> 30 ppi and back to the tank. I clean the 10 ppi about three times a year, and the 20 ppi & 30 ppi once or twice a year.
 
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