FLFishChik Posted December 24, 2022 Share Posted December 24, 2022 So, I don’t know why I haven’t done this sooner, but I’ve been reading about other hobbyists putting poly-fil in their HOB filters. I have sponges and media rings in there now.., where would I place the poly-fil- in between? 1 Link to comment Share on other sites More sharing options...
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