Pentair Clean & Clear 160318 Pool Cartridge Filters feature a chemical resistant tank with No-tool servicing and a core-less cartridge for easier cleaning. All models are equipped with easy spin-on unions for plumbing hook-ups. These filters are NSF listed for commercial applications and are available in 50, 75, 100, 150, and 200 square foot sizes. Clean & Clear combines top-end filter performance with low maintenance. This dependable design uses special filter elements to strip tiny particles from your pool water... particles as small as 30 microns. (An average grain of beach sand is 1000 microns!) And cleaning is a snap. Open the top, remove the cartridge, hose it off, and Clean & Clear is ready to go again. We've maximized cartridge surface consistency to block and trap the maximum amount of solids. Plus, we use the most durable materials to extend cartridge life. Clean & Clear will keep your pool sparkling day in and day out. Like all Pentair cartridge filters, Clean & Clear features an easily cleaned cartridge for the ultimate in carefree pool filtration. The fiberglass reinforced tank halves are secured with an innovative clamp ring - just loosen the ring and remove the top half for easy cartridge access and rinsing. Filter maintenance doesn't get any easier.