Erik W. Posted January 24, 2021 Share Posted January 24, 2021 Hi everyone! I needed to modify my large pre filter sponge to fit my surface skimmer attachment. I cut off what wasn't needed and thought how it looked like a small Aquarium Co-Op Sponge Filter replacement. I have a spare small sponge filter from the co-op so I decided to try it out and it works!! I apologise if this is common knowledge but I wanted to pass this along to anyone who's lost or ruined their sponge and couldn't find a replacement. FYI the pre filter sponge seems to not have as many pores per square inch and I have not tried it on a bigger filter size than a small. I hope this helps! All the best, Erik 2 Link to comment Share on other sites More sharing options...
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