Watts W-1812-50 RO MembraneWatts Flowmatic W 1812 50 RO Membrane is a 50 gallon per day reverse osmosis thin film composite (TFC) membrane. Fits most standard RO units including but not limited to the Flowmatic FMRO4J, FMRO4G, FMRO5J, FMRO5G, FMRO5GP, FMRO4ERP, FMRO5 C, FMRO4 ZW, FMRO5MT, FMRO4 ERP. The W181250 membrane is 1. 8" x 11. 8" Membrane should be changed every 2 5 years depending on water quality and usage.
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