Check the listing for details. RAINSOFT ULTREFINER UF50 UF50T UF50N 50 GPD FILTER PACK - WELL WATER. Condition: New. Listed at 56.89 USD. This Fits RAINSOFT ULTREFINER UF50 UF50T UF50N ( Does Not Fit ULTREFINER II ) 1 - RAINSOFT TFC-RS9-50 REVERSE OSMOSIS MEMBRANE 50 GPD1 - 5 MICRON SEDIMENT PRE FILTER1 - 5 MICRON CARBON BLOCK POST FILTER CHANGE THESE FILTERS EVERY 6-12 MONTHSSANITIZE YOUR RO EVERY 6-12 MONTHSALWAYS LUBE THE MEMBRANE BRINE SEAL BEFORE INSTALLING TO AVOID DAMAGEALL ITEMS ARE NEW AND NSF CERTIFIED AND FACTORY SEALED Brand New Items Sealed in BagsTHESE ARE THE PROPER FILTERS IF YOU HAVE WELL WATERReplace Membrane Every 6 months - 1 Year.Replace All Other Filters at Least Every Six (6) MonthsRAINSOFT COMPATIBLE FILTERSNot compatible with Ultrefiner II MADE IN THE USA BY CLEAR HYDRO PRODUCT DETAILS: Rainsoft Membrane Part Number: 18644 (UF50T-CBVOC & UF50N-CBVOC)Rainsoft Sediment Pre Filter Part Number: 12461 (UF50T-CBVOC & UF50N-CBVOC) and 9547, 9528, 9747, 13110, 17367Rainsoft Carbon Block Post Filter Part Number: 18773 (UF50T-CBVOC & UF50N-CBVOC) and 9757, 12464, 13119, 17368, 18557Rainsoft Ultrefiner Compatible membrane for the Ultrefiner, UF50, UF50T-CBVOC, UF50N-CBVOC, 9564, 9568, 9596, 9596N, 9798 (without post filter), M-T1810R24, 12446, 13018, 17374, 21176, 21191 reverse osmosis systems. NSF/ANSI Standard 58 Tested and Certified This membrane removes or reduces the following contaminants: arsenic, barium, chromium, cadmium, copper, cysts, fluoride, lead, radium, selenium, turbidity, TDS, nitrate, nitrite, magnesium, calcium, sodium, nickel, mercury, zinc, iron, ammonium, bicarbonate, sulfate, tannin, chloride, bromide, and sediment.