Thank you; I have toyed with the idea of changing them for something more DIY with foam and rings and such. As it stands, I keep a chunk of Fluval foam and little sack of BioMax in the intake chamber of the Aqueon as an added spot for BB growth and to possibly catch some extra solid debris.When I had those cartridges, I reused and cleaned them the same way as you without any issues Now I replace the cartridge and use bio rings and sponges which IMO works much better