Upgrade your filter system with FlowXtreme® CottonTails® filter media. This state-of-the-art media is 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 the most efficient cartridge filters.Enjoy pure water that's less reliant on costly chemicals. FlowXtreme® CottonTails® cartridge replacements are easy to maintain. Simply remove the filter media, place in a mesh bag, and wash in a your washing machine. Stop purchasing new cartridges every season, and switch to an alternative that will last for years. This clean, easy alternative replaces most A and C cartridge filters. 90-day warranty.