Bests & Worsts Reviews from Amazon

Quiet, moves a lot of water, and easy to clean. At first I thought this filter was just "ok" because the water wasn't dirty, but it also wasn't crystal clear. But after reading several aquarium forums I learned about people using 100% poly-fil with their filtration. I decided to try this method before going with a canister filter and boy am I glad I did! I cut and placed the poly-fil after the mechanical filtration (sponge) in two layers ( just folded over) to the same length as the sponge and added the other filters ( carbon & bio). The poly-fil will compress so you do not have to worry about everything not fitting once you assemble it. After about 30 minutes I had the clearest water ever! The poly-fil will not affect pH levels and was purchased at a local wal-mart for less than $5 for a 36" x 45" roll. Update: Also great for saltwater filtration. Just ditch the ceramic rings.