I really appreciate you trying to help, but I think I’m giving up. Try to find a filter cartridge replacement on that site and how much. The link they give don’t even sell them. Fact is, two of the wholesale and retail links don’t work. Like I said, I’ve looked around without much success. I did find another site “that some said in a review” their filters work in them, but, to much $$$. I am pretty much thinking of using them for trash cans. Then using the pump that came with them for my sump build if possible. If not, it can also go into the pile of aquarium junk I no longer use. If I find a way to use them productively, I’ll be sure to post back.