Clean & Clear® Plus cartridge filter from Pentair combines top-end filter performance with low maintenance. The dependable design of the Clean & Clear Plus uses special filter elements to strip tiny particles from your pool water…particles as small as 30 microns. If that doesn't mean much to you, how about this for some perspective. A single grain of beach sand......1,000 microns! Pentair's four-cartridge design provides maximum filter surface area to capture more dirt and extends time between cleaning. And cleaning is a snap. Open the top, remove the cartridges, hose them off, and Clean & Clear Plus is ready to go again.