Replacement 75 Square Foot Cartridge Filter Element. Made of the highest quality Remay fabric from Dupont, this filter will pick up dirt as small as 5 microns. We recommend you clean these with dish washing detergent and a powerful hose. Replace as needed. They function best however when they are a little dirty. Comes with one year warranty. ELE75 75 SQ FT Filter Element, 7 1/4" x 14 9/16" MAXIMUM WORKING PRESSURE FOR ALL MODELS 40 PSI CAUTION: All suction and discharge valves must be open when starting the system. Failure to do so could cause severe personal injury and/or property damage. Be sure locking knob is secure (hand tighten-only, slight pressure is required). REMOVING CARTRIDGE ELEMENT 1. Shut off the pump. 2. If filter is located below water level, close valves or block off suction discharge lines to prevent backflow of water from the source. 3. Unscrew and remove locking ring (counterclockwise direction) and carefully lift off top cover to gain access to filter cartridge. 4. Lift out cartridge and clean. Or, replace with clean, spare cartridge. REINSTALLING NEW CARTRIDGE ELEMENT 1. Clean any collected debris from the bottom of filter body. 2. Carefully replace cartridge element into filter body ensuring that the cartridge sits evenly on the collector hub at the bottom of filter body. 3. Place cover on filter body (being sure filter head 0-ring is in place and clean). 4. Tighten locking ring in clockwise direction. (Hand tight only.) 5. Proceed as in STARTING THE FILTER. MODEL / EFFECTIVE FILTRATION AREA /DESIGN FLOW RATE Ft 2 GPM CF50 50 50 CF75 75 75 CF100 100 100 CF150 150 150