Absolutely love this filter material; works like a charm. I use this in the 3 canister filters I use it as the last filter in my sponge baskets and I also use it as the last thing water passes through before it goes into my tanks. My water is crystal clear and my fish don't look like they're swimming in water; they look like they're flying in a big glass container. I highly recommend Pinky & for the price of a roll you get 20x more filters than if you'd buy pre-cut polishing filters equaling the same cost as this roll. I change them out once a month & a roll this size will last me a couple years. I have a 90G tank (soon to be upgraded to a 150G) overstocked with Peacocks and Haps ran by 2 canisters; a Fluval FX6 & SunSun 704B. I also have a 40G community tank ran by a Marineland 360 canister. I also have 3 other smaller tanks ranging from 1.5G-15G that have backside sumps I use Pinky in them as well.The purchase & shipment of Pinky was as flawless as my water is!