Upgrade your filter system with Cotton Tails filter media. These state-of-the-art media are constructed from a network of tightly woven polyethylene strands. The result is precise performance and crystal clear water. With filtration down to 3 microns, you'll enjoy a 10x improvement over sand. This 1.5-lbs box replaces 50 lbs of heavy, hard-to-manage sand.Enjoy cleaner, clearer water that's less reliant on costly chemicals, with filtration that's only matched by expensive, dangerous DE filter systems. With a greater capacity for particulates than sand, it also requires less backwashing. How can you go wrong? Stop breaking your back with heavy bags of hard-to-manage sand, and switch to media that's lighter, smaller and smarter.