Rainsoft CTA-RS9-10 Reverse Osmosis Compatible Membrane 10 GPD
Outstanding Rainsoft Ultrefiner compatible 10 gallons per day membrane. Made in the United States. Should be installed in system model # 9590, 9564, 9593, UF-10, 21173, 9393, 9594. Change these membranes every three years, and sometimes sooner depending on your quality of water.