Large selection of replacement water filters, reverse osmosis membranes, testing kits and water filter system repair parts. From one water filter or membrane to case quantity discounts.

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RainSoft Water Filters ®

RainSoft ® Ultrefiner RO Compatible Replacement Sediment Prefilter Water Filters for RainSoft Reverse Osmosis Systems
  1. KX Matrikx ® 10/2 Carbon Block Water Filter # 10-250-190-975 Replacement-1000
    KX Matrikx ® 10/2 Carbon Block Water Filter # 10-250-190-975

    The KX 10/2 has been discontinued. If you order the KX 10/2 you will receive the GGN 10/2 Carbon Block Filter. 9 7/8" long X 2 1/2" diameter OD X 1 1/4" diameter ID. 25 per case, sold individually. Order a case and save even more.

    Learn How To Upgrade Your Reverse Osmosis Membrane Capacity

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    $17.99 Special Price $9.99 As low as $6.99
  2. Rainsoft Ultrefiner Compatible TFC-RS9-22 RO Membrane 9568-21176 - 12448-17374-1000
    RainSoft ® Ultrefiner Compatible TFC-RS9-22 RO Membrane 9568 - 21176 - 12448 -17374
    RainSoft ® Ultrefiner Compatible TFC-RS9-22 Reverse Osmosis RO Membrane - TFC 22 Gallon Per Day Membrane - Ref # 12448, 17374, 21176 & 13018. (fits 9568, 9564, 9596, 9596N, UF22T & others) Learn More
    $69.99 Special Price $49.99 As low as $34.99
  3. RAINSOFT- Ultrefiner Compatible TFC-RS9-50 RO Membrane UF50-18571-12447-18644-17370-21179- 1000
    RainSoft ® Ultrefiner Compatible TFC-RS9-50 RO Membrane UF50 - 18571 - 12447 - 18644 - 17370 - 21179
    RainSoft ® Ultrefiner Compatible TFC-RS9-50 Reverse Osmosis RO Membrane - TFC 50 Gallon Per Day Membrane. Reference # 18644, 18571, 12447, 21179, 17370 for 9757, 21191 & UF50T. Learn More
    $79.99 Special Price $59.99 As low as $44.99
  4. GE Osmonics ® Purtrex PX-5-978 Sediment Replacement Water Filter # 93023
    GE Osmonics ® Purtrex PX-5-978 Sediment Water Filter # 93023
    GE Osmonics ® Purtrex PX-5-978 5 Micron Sediment Water Pre Filter. True-graded density pure polypropylene depth replacement water filter. # 93023 9 7/8" long X 2 1/2" diameter. 40 per case, sold individually. Order a case and save even more. Learn More
    $8.99 Special Price $5.99 As low as $3.99
  5. Pro Products Sani System Sanitizer
    Pro Products Sani System Sanitizer
    Pro Products Sani System Sanitizer. 0.25 or 0.5 fl. oz. concentrate. Sani-System ® Pro Products is proud to introduce Sani-System, the first and only EPA product approved for sanitizing water softeners, RO units and Water Coolers. Sani System is proven to kill 99.9% of E. coli, E. coli O157:H7, Staphylococcus aureus, Listeria monocytogenes and other harmful bacteria. It does not use chlorine, other oxidizers or acids that can harm water softener equipment parts. Use is simple; each dose comes in a pre-measured pouch. Just cut, pour and regenerate softener. No measuring, No mess! Sanitizing Equipment! Applications Interior Surfaces of Water Softeners, Reverse Osmosis (RO) Units, Ice Machines, Water Coolers, Water Holding Tanks and Pressure Tanks. Sani-System is now NSF certified! This is the best sanitizing solution available anywhere! Stock up and save. Learn More
    $7.99 Special Price $4.99 As low as $2.49
  6. TDS Meter - Test For Total Dissolved Solids In Water - Reverse Osmosis Membrane Tester - TDS Meter
    TDS Meter - Test For Total Dissolved Solids In Water - Reverse Osmosis Membrane Tester - TDS Meter
    TDS Meter - Tester. The Only Way To Know If Your Reverse Osmosis RO Membrane Is Performing Correctly - Tests for TDS - Total Dissolved Solids. A Must For All RO System Owners. Compare Incoming Feed Water To Treated Water - Replace Membrane If Less Than 80% of TDS Is Being Removed - The lower the TDS level in the water, the more efficiently your body's cells actually get hydrated by the water that you drink. The higher the TDS levels in the water, the greater the probability of harmful contaminants that can pose health risks or hinder the absorption of water molecules on the cellular level. Simple to use for Reverse Osmosis membrane monitoring. We really like this tester and think that anyone who wants to know about the quality of their water should have one of these TDS Meter Testers to monitor their RO membrane. Learn More
    $49.99 Special Price $37.99 As low as $17.99
  7. TDS Meter Inline Water Tester DM1 - HM Digital Dual Mode Reading
    TDS Meter Inline Tester- Dual Mode Reading - Easily Installs Inline - Very Simple To Use
    TDS Meter - Dual Mode - Installs Inline - Check the TDS level with the push of a button. Now you can easily check to make sure the water from your reverse osmosis system is top quality. Measure the tap water coming in vs. the purified water going out of your system at any time. Very easy installation. FEATURES Displays TDS levels of the feed water and product water with in & out electrode probes. Highly efficient and accurate due to its advanced microprocessor technology. Auto-Off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use. Comes equipped with John Guest Quick-Connect T-fittings as shown. Installs quickly and easily. SPECIFICATIONS Range: 0-9990 ppm Accuracy: ±2% Always know if your RO membrane is performing correctly! Learn More
    $49.99 Special Price $39.99 As low as $19.99
  8. GE Osmonics ® Purtrex PX-30-978 Sediment Water Filter # 93020
    GE Osmonics ® Purtrex PX-30-978 Sediment Water Filter # 93020
    GE Osmonics ® Purtrex PX-30-978 30 Micron Sediment Water Pre Filter. True-graded density pure polypropylene depth filter. # 93020 9 7/8" long X 2 1/2" diameter. 40 per case, sold individually. Order a case and save even more. Learn More
    $8.99 Special Price $5.99 As low as $3.99
  9. Molykote-From DOw Corning- 111 Compound-6 Gram O-ring Silicone Lubricant & Sealant-Dow-111-5-gram-1000
    Dow Corning (Molykote) ® 111 6 gram O-ring Silicone Lubricant and Sealant - Be sure to lube your O-rings to help prevent leaks.
    Dow Corning/Molykote ® 111 6 gram O-ring Silicone Lubricant and Sealant - 6 gram pillow pack. (like a ketchup packet) Great O-ring sealant and lubricant. FDA and NSF approved. (Do Not Use Petroleum Jelly As It May Break Down O-rings Or Housings) This is the same premium grade silicone sealant and lubricant used in underwater photography cameras, scuba gear and other underwater applications that simply can't afford leaks. Why not use the best for your reverse osmosis or drinking water filtration system?

    Dow 111 Silicone MSDS Safety Sheet

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    $5.99 Special Price $3.99 As low as $1.79
  10. Omnipure CL-10RO-T/33 GAC Inline Replacement Water Filter-1000
    Omnipure ® CL-10RO-T/33 GAC Inline Water Filter
    Omnipure ® CL-10RO-T/33 GAC - 10" X 2" Carbon Inline Replacement Post Water Filter - GAC (granular activated carbon) Acid Washed Carbon - Should be changed at least every 12 months. 25 per case, sold individually. Order a case and save even more. Learn More
    $21.99 Special Price $11.99 As low as $9.49
  11. Omnipure CL-6RO-T/33 GAC Inline Replacement Water Filter-1000
    Omnipure ® CL-6RO-T/33 GAC Inline Water Filter
    Omnipure ® CL-6RO-T/33 GAC - 6" X 2" Carbon Inline Replacement Post Water Filter - GAC (granular activated carbon) Acid Washed Carbon - Should be changed at least every 12 months. 50 per case, sold individually. Order a case and save even more.

    Check Water Filter Connector Sizes

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    $17.99 Special Price $9.99 As low as $6.49
  12. RainSoft- Compatible Ultrefiner CTA-RS12-10 RO Reverse Osmosis Membrane- 1000
    RainSoft ® Ultrefiner CTA-RS12-10 RO Compatible Reverse Osmosis Membrane 9744 17379
    RainSoft ® Ultrefiner CTA-RS12-10 RO Compatible Reverse Osmosis Membrane 9744 17379. RainSoft ® Ultrefiner Compatible CTA-RS12-10 Reverse Osmosis RO Membrane - CTA 10 Gallon Per Day Membrane - 9744 & 17379 (CTA-C112-10) (fits 9784, 9787, 9788, 9669, 9684, 9687, 9688, 9689, 9324, 9329, 9334, 9338, 9339, 9369, 9374, 9389, 9394, 9524, 9529, 9539, 9538, 9544 & others) C212-10-MU (CTA - ERO-200 Compatible) Learn More
    $89.99 Special Price $69.99 As low as $49.99
  13. RainSoft Hydrefiner P-12- Compatible Replacement Water Filter for #9875 - 9879, 17561, P12, 17366, and 13199 - Lifestyle Photo 1-1000
    RainSoft ® Hydrefiner Compatible P-12 # 9875 - 9879 17561, P12, 17366 13199 Replacement Water Filter
    RainSoft ® Compatible P-12 # 9875 P12, Replacement Water Filter - Fits 9878, 9879 & Other Hydrefiner Systems - # 17561, 17366 , 13199. 6" long by 4 9/16" diameter. - 1/2" UNS Compression Female Threaded - Installation Note: The threaded part in the top of the housing cap is a "nipple". It may come out with the filter or with the housing. Whichever one it is in after the filter is removed the nipple can then be taken from the other item. It is just a small section of threaded tube. 12 per case, sold individually. Order extras and save even more. Learn More
    $89.99 Special Price $48.99 As low as $26.99
  14. RAINSOFT - HYDREFINER P-6 - #9868, P6, 9791, & 17365- Compatible Water Filter- 1000
    RainSoft ® Hydrefiner P-6 # 9868, P6, 9791, 17365 Compatible Replacement Water Filter
    RainSoft ® Hydrefiner Compatible P-6 # 9868, 9794, 9791, 9751, 9277, P6 - Fits 9865, 9755, 9765 (226679), 9246, 167553. - 8 1/2" X 2 1/2" - Replacement Water Filter #12468, , 142197, 14530, 17365 - 1/4" FNPT screw on. - Installation Note: The threaded part in the top of the housing cap is a "nipple". It may come out with the filter or with the housing. Whichever one it is in after the filter is removed the nipple can then be taken from the other item. It is just a small section of threaded tube. Be sure to replace the o-ring and lubricate with Dow 111 silicone sealant. 24 per case, sold individually. Oder extras and save even more. Learn More
    $69.99 Special Price $36.99 As low as $21.99
  15. RainSoft Ultrefiner - Comptaible Reverse Osmosis RO Membrane TFC-RS12-10 - 1000
    RainSoft ® Ultrefiner TFC-RS12-10 Compatible Reverse Osmosis RO Membrane T-212-10-MU 17378
    RainSoft ® Ultrefiner TFC-RS12-10 Compatible Reverse Osmosis RO Membrane T-212-10-MU 17378. TFC 10 Gallon Per Day Membrane - Ref# 17378 & T-112-10-MU Fits 9772 & others. (fits 9654, 9664, 9666, 9330, 9345, 9346, 9370, 9523, 9530, 9532, 9543, 9545, 9346 & others) (ECO TFC ERO-300 Compatible) T112-10 Learn More
    $89.99 Special Price $69.99 As low as $49.99
  16. RainSoft Ultrefiner - TFC-RS12-16    9548 17377 - Compatible Reverse Osmosis RO Membrane - 1000
    RainSoft ® Ultrefiner TFC-RS12-16 9548 17377 Compatible Reverse Osmosis RO Membrane
    RainSoft ® Ultrefiner TFC-RS12-16 9548 17377 Compatible Reverse Osmosis RO Membrane. RainSoft ® Ultrefiner Compatible TFC-RS12-16 Reverse Osmosis RO Membrane - TFC 15 Gallon Per Day Membrane - Ref# 17377 & T212-16-MU Fits 9548 & others. (fits 9554 & others) Learn More
    $89.99 Special Price $69.99 As low as $39.99
  17. RainSoft Ultrefiner TFC-RS9-12-Compatible Reverse Osmosis RO Membrane 9565 17375-1000
    RainSoft ® Ultrefiner TFC-RS9-12 Compatible Reverse Osmosis RO Membrane 9565 17375
    RainSoft ® Ultrefiner TFC-RS9-12 Compatible Reverse Osmosis RO Membrane 9565 17375. TFC 12 Gallon Per Day Membrane - Ref # 13016, 17375 for 9565 and others. (fits 9591, 9594, 9565 & others) Learn More
    $69.99 Special Price $45.99 As low as $29.99
  18. RainSoft ® Ultrefiner TRS2514-150 Compatible Reverse Osmosis RO Membrane 9792, 17380, 9556
    RainSoft ® Ultrefiner TRS2514-150 Compatible Reverse Osmosis RO Membrane 9792, 17380, 9556
    RainSoft ® Ultrefiner TRS2514-150 Reverse Osmosis Compatible RO Membrane 9792, 17380, 9556. TFC 150 Gallon Per Day Membrane - Ref.# 17380 & M-T2514AP Fits 9792 & others. (fits 9690, 9695, 9696, 9340, 9350, 9355, 9356, 9390, 9395, 9396, 9550, 9555, 9556, 9694X2 & others) We suggest replacing this membrane, housing and flow restrictor with standard sizes. A standard size replacement membrane is much less expensive and so much easier to replace. We suggest using the standard size Dow Filmtec 100 GPD membrane, RO membrane housing and 1000 ml inline flow restrictor. Ordering the RainSoft TRS2514-150 here will be fulfilled with the Dow Filmtec 100 GPD membrane, Membrane housing and matching flow retrictor. Learn More
    $149.99 Special Price $99.99 As low as $74.99
  19. Pentek P25-20 # 155226 P2520 Polydepth Sediment Replacement Water Filter Cartridge
    Pentek P25-20 # 155226 P2520 Sediment Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands
    Pentek P25-20 # 155226 P2520 Sediment Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands Spun Polypropylene 25 Micron Sediment Water Filter. 20" long X 2 1/2" diameter. 20 per case, sold individually. Ametek # 155226 P-Series cartridges are manufactured from 100% pure polypropylene fibers. The fibers have been carefully spun together to form a true gradient density from outer to inner surfaces. These cartridges are designed for purity. They will not impart taste, odor or color to the liquid being filtered when used within the recommended temperature limit. Also, the polypropylene construction provides superior chemical resistance and is not prone to bacterial attack. The coreless strength of the cartridges is achieved by sintering the many fibers into a solid matrix. Order a case and save even more. Learn More
    $12.99 Special Price $8.99 As low as $6.99
Be sure to check our Parts Department for important parts such as TDS Testers For Reverse Osmosis Membranes, Replacement Tanks, O-rings , Filter Housing Wrenches, Faucets, Pumps, Fittings, UV Systems and more parts for your reverse osmosis pure water filtration system.   View maintenance and servicing tips online at our Installation & Trouble shooting Guide.