Review on 🐠 Enhance Your Lifestyle with CORISRX B&G Aquarium Sponge Filter Foam - Water Media Pads: Sizing, Benefits, and More! by Holly Smith

I use this for both mechanical and biological filtration. It is thick enough to be cut in half and then trimmed to fit. I used a bread knife, which worked great. I use it in the first pan of my coarse filter canister with polyfill on top for fine filtration. I wash it in aquarium water to clean it about once a month. It catches a lot of dirt while breeding beneficial bacteria. The versatility of this material would allow it to be used for many other purposes. It is stiff enough and thick enough to be used as a divider when needed. I suppose you could add an air stone and make a sponge filter out of it. This is a good product at a good price. I will buy more if I use this.