This is amazing, I cut out 2 pieces and put them on top of each other to make it thicker and the flow is still the same! Goes right through it like butter and traps ALOT of debris and waste. I'd buy this again if it ever goes bad which I doubt it, it's very durable. A little warning though, dull blade and such won't get through it cleanly so use a very sharp scissor.For the money this is quality filter material..it’s reusable and does the trickI purchased to use in 10 gallon aquarium. Piece is large enough to last me a long time. I will be able to cut several pieces. Easy to cut to size. Easy to clean. Yes, size is very large to use for just 10 gallon aquarium. But husband constantly over feeds. Due to disabilities it takes me numerous hours to clean aquarium. I was hoping this would help me go longer in between cleanings. It isn't working like I thought it would. At this point, I do not think it's working any better than filter material I was previously using. When I rinse out I am not seeing as much captured debris as with other filter materials I have been using which really does surprise me. Product not working may be my error. It may be that this product can't be used for what I need.Unfortunately, these worked too well.My mistake I tried using in a pond filter. Far too fine a filter for a 900 gallon pond.My sediments collected quickly and completely clogged the goldfish pond, not allowing enough circulation through the system.. (my fault in selecting)Nice filters! But use in aquarium instead.Easy to use, just cut with scissors to size. works better than disposable filters in my fish tanks, and easy to clean. I would recommend this for anyone with an aquarium.I bought this filter for my small 5 gal aquarium to replace the inserts in the hanging filter. Since then the water has never been so clean. It is literally sparkling.This particular foam filter pad is amazing! I use it in a wet/dry filter for my 210 gallon, and I cut 2 pieces to fit in my Hydor Canister Filter for my 20 gallon. It's so great, AND easy to clean. It claims that it can be reused up to 200 times. I just got it, but so far, so good. I'd highly recommend this filter though.