I bought this as a weir filter for my biological waterfall. The water passed through the biobeads in the waterfall reservoir and flowed through the sponge on its way to the weir. This did an excellent job of filtering, but after a day it became clogged and the water was bursting through the walls of the waterfall tank. I should have ordered a coarser sponge. But I will use this in my aquarium.
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