Cyndi Posted December 30, 2021 Share Posted December 30, 2021 Hi everyone! I need a replacement sponge for my Filter MAX III that I'm using on my fx 4. OR I need a replacement sponge for my ehiem prefilter. In both cases, I would just order another, but Amazon is out. Does anyone know if the Co-Op sponges will fit either of these? Thanks so much! Cyndi Link to comment Share on other sites More sharing options...
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