Adrienne Posted April 26, 2008 Report Share Posted April 26, 2008 Looking to get hold of large pieces of sponge, similar to the stuff used inside cannister filters, to use as the first step in my sump. Currently have filter wool in there but want something better to filter out the worst muck before it reaches the bio spheres. What does everyone use? Quote Link to comment Share on other sites More sharing options...
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