Replacement water filters, RO reverse osmosis membranes and whole house filter systems. Refrigerator water filters, pool and spa filter. Pentek, OMNIFILTER water filters. Chiller Daddy water chillers

DI Deionization Water Filters

DI Deionization Water Filters

Add-on DI Deionization Water Filtration Systems and Replacement Cartridges

10" DI Deionization Add-on for RO Reverse Osmosis Systems

20" DI Deionization Add-on For Higher Flow Rate Applications

20" Big Blue DI Deionization Add-on For Extra High Flow Demand Applications

  1. Regular Price: $38.99

    Special Price $29.99

    As low as: $24.99
    Pentek PCF1-10MB # 155273 PCF110MB Deionization Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands Deionization Water Filter. FDA D.I. Resin. 9 3/4" long X 2 7/8" diameter. 6 per case, sold individually. Ametek # 155273 PCF Series cartridges have been developed in response to the requirements for deionized water in many industries. They are manufactured using an FDA-compliant resin that has been subjected to additional post-production steps to minimize the total organic carbon (TOC) level. This high capacity, semi-conductor-grade resin cartridges are ideal for use in pharmaceutical and medical laboratories, cosmetics and circuit board printing applications. Order a case and save even more. Learn More
  2. Regular Price: $63.99

    Special Price $49.99

    As low as: $42.99
    Pentek PCF1-20MB # 155274 PCF1 20MB Deionization Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands Deionization Water Filter. FDA D.I. Resin. 20" long X 2 7/8" diameter. 6 per case, sold individually. Ametek # 155274 PCF Series cartridges have been developed in response to the requirements for deionized water in many industries. They are manufactured using an FDA-compliant resin that has been subjected to additional post-production steps to minimize the total organic carbon (TOC) level. This high capacity, semi-conductor-grade resin cartridges are ideal for use in pharmaceutical and medical laboratories, cosmetics and circuit board printing applications. Order a case and save even more. Learn More
  3. Regular Price: $149.99

    Special Price $119.99

    As low as: $99.99
    Pentek BBF1-20MB Deionization Water Filter # 155281 Compatible With Ametek / US Filter / Plymouth / Culligan / Kleen Plus / American Plumber / Bruner / Many Other Brands. FDA D.I. Resin. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155281 Order a case and save even more. Learn More
  4. Regular Price: $29.99

    Special Price $19.99

    As low as: $13.99
    US Filter Pentek 158005 Blue Slimline 10" Filter Housing - Includes pressure relief button for easy filter changes. For 10", 9 7/8" & 9 3/4" replacement filter cartridges. - 3/8" Female NPT Threaded Ports. Typical housing for use in replacing a damaged RO filter housing or for a single stage filter for POU (point of use). Learn More
  5. Regular Price: $39.99

    Special Price $29.99

    As low as: $23.99
    US Filter Pentek 158007 Slimline 10" Clear Filter Housing - Slimline Filter Housing - 3/8" Female NPT Threaded Ports. Includes pressure relief button for easy filter changes. For 10", 9 7/8" & 9 3/4" replacement filter cartridges. - Typical housing for use in replacing a damaged RO filter housing or for a single stage filter for POU (point of use). Learn More
  6. Regular Price: $9.99

    Special Price $6.99

    As low as: $4.29
    Pentek ® 244047 SlimLine Water Filter Housing Mounting Bracket Kit. For all 5", 10" & 20" Pentek SlimLine Water Filter Housings. Bracket and screws. Learn More
  7. Regular Price: $8.99

    Special Price $4.99

    As low as: $3.99
    John Guest ® Super Speedfit Quick Connectors - Male - Straight - MNPT - Sold in pairs. Price is per pair. These fittings are manufactured in gray acetal copolymer with food grade nitrile ‘o’ ring, making them especially suitable for applications involving foodstuff and potable liquids like reverse osmosis drinking water. They are equally suitable for air and inert gasses and can therefore be used on CO2 lines, pneumatic applications, and vacuum. For more than a decade, John Guest has been supplying Super Speedfit fittings to the Water Purification market for drinking water applications in homes, restaurants and industry. John Guest products are listed with the WRC(UK), NSF(US) and SK(Germany). PI010821S , PI010822S , PI010823S, PI011222S , PI011223S Learn More
  8. Regular Price: $8.99

    Special Price $4.99

    As low as: $3.99
    ohn Guest ® Super Speedfit Quick Connector - Male - Elbow - John Guest Super Speedfit Quick Connectors - Male - MNPT - Sold in pairs. Price is per pair. These fittings are manufactured in gray acetal copolymer with food grade nitrile ‘o’ ring, making them especially suitable for applications involving foodstuff and potable liquids like reverse osmosis drinking water. They are equally suitable for air and inert gasses and can therefore be used on CO2 lines, pneumatic applications, and vacuum. For more than a decade, John Guest has been supplying Super Speedfit fittings to the Water Purification market for drinking water applications in homes, restaurants and industry. John Guest products are listed with the WRC(UK), NSF(US) and SK(Germany). PI480821S , PI480822S , PI480823S , PI481222S , PI481223S Learn More
  9. $0.27
    John Guest ® Poly Tubing For Pure Drinking Water Systems - 1/4", 3/8" and 1/2" O.D. (Outer Dimension) High Grade Drinking Water Tubing. Speedfit quick connector compatible. Choose the 3/8" O.D. For Use With Optional Drain Saddle For Air Gap Faucet. Sold by the foot. Order 20 to get 20 feet. Learn More
  10. Regular Price: $9.99

    Special Price $6.99

    As low as: $4.99
    Pentek SW-1 # 150539 SW1 Slim Line Water Filter Housing Spanner Wrench Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. SW-1 Water Filter Housing Wrench. Fits 4" Slim Line Housings. (Slim Line Housings Have A 3 1/2" diameter "O" Ring) Ametek # 150294 Only for use in loosening filter housings, never to tighten. Overtightening may cause damage to the O-rings and make re-opening VERY difficult. Hand tighten only. Fits most standard style RO systems. Replaces 150294. For really stubborn filter housings our technicians will use two wrenches together for maximum power where one wrench might break or not do the job. Our techs know the tricks.Order New O-rings And Be Sure To Lube Them With Dow 111 Silicone Sealant To Prevent Leaks Learn More
  11. Regular Price: $47.99

    Special Price $34.99

    As low as: $29.99
    Pentek ® 158129 SlimLine 20" Water Filter Housing. 3/8" Female NPT threaded ports. No pressure relief valve. Uses SW-1 wrench and 151121 o-ring. Learn More
  12. Regular Price: $89.99

    Special Price $74.99

    As low as: $68.99
    Pentek ® 150233 20" Big Blue Water Filter Housing. Integral pressure relief button for easier filter changing. 1" Female FNPT inlet / oulet ports. HFFP /pr. Learn More
  13. Regular Price: $34.99

    Special Price $26.99

    As low as: $22.99
    Pentek ® 150061 Mounting Bracket For 10" & 20" Big Blue & Big Clear Filter Housings. Includes bracket and screws. Heavy Duty. Learn More
  14. Regular Price: $12.99

    Special Price $8.99

    As low as: $5.99
    Pentek SW-4, SW4 Big Blue Water Filter Housing Spanner Wrench Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. SW-4 Big Blue Water Filter Housing Wrench - For 20" Big Blue 5 7/8" Filter Housing Wrench. (Big Blue Filter Housings Use A 5 3/4" Diameter "O"Ring) Only for use in loosening filter housings, never to tighten. Overtightening may cause damage to the O-rings and make re-opening VERY difficult. Hand tighten only. For really stubborn filter housings our technicians will use two wrenches together for maximum power where one wrench might break or not do the job. Our techs know the tricks. Learn More
  15. Regular Price: $49.99

    Special Price $37.99

    As low as: $17.99
    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
  16. Regular Price: $49.99

    Special Price $39.99

    As low as: $19.99
    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
  17. Regular Price: $5.99

    Special Price $3.99

    As low as: $1.79
    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

    Learn More
  18. Regular Price: $7.99

    Special Price $4.99

    As low as: $2.49
    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

Easy TDS Membrane Performence Calculator
See If It is Time To Replace Your Membrane

Simply enter your Feed Water TDS and RO Water TDS into the boxes above and click "Submit". The percentage of TDS (total disolved solids) rejection will be displayed. We normally recommend membrane replacement once you drop below 75%. This may vary in areas with high TDS in the feed water.   Let the tap water and reverse osmosis water run for a few seconds before drawing your sample.

See our selection of TDS meters under Water Tests.  Knowing the rejection rate is the only wat to know if it is time to replace your reverse osmosis membrane.



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.