Reverse Osmosis System Filters, RO Membranes and Parts

Water Doctors PRO-4000 4 Stage RO Reverse Osmosis System

Water Doctors PRO-4000 4 Stage RO Reverse Osmosis System

Water Doctors PRO-4000 4 Stage RO Reverse Osmosis System With "-60" Threaded Filters and "-60" Threaded RO Membrane

Simply replace your Water Doctors -60 filter heads and start using the standard threaded Omnipure "Q" series replacement water filter cartridges at a lower cost than the -60 threaded filter cartridges. 

Only the filter heads will need replaced.  Choose either the valved or non-valved heads.  The valved head will turn off the water to each filter as the cartridge is removed.  If you wish an even easier way to upgrade order the full replacement system below which has the standad threaded Omnipure "Q" series heads and replacement filters and RO membrane included.  Simply disconnect the inlet and outlet tubes from the old system and connect them to the new system.  Done!

 

HMI-15, 36,50 Reverse Osmosis Membrane


Choose any of the 3 RO Reverse Osmosis Membranes listed below based on your preference.  15, 36 or 50 GPD (gallons per day)  Any of the 3 will work.  The larger the GPD rating the faster the system will produce water and store it in the tank ready for use.

Once you convert to the standard "Q" series head you will be able to start sanitizing your RO system using the sanitizing cartridge listed below.  You will need 4 to fully sanitize your system.  They are reusable indefinately.

The PRO-4000 reverse osmosis system uses John Guest ® quick connectors. 

  1. Omnipure Water Filter Q Head Replacement #NVH1/4
    Omnipure Water Filter Q Head Replacement #NVH1/4
    Omnipure Water Filter Head Replacement. Non Valve Head. 1/4" FNPT ports for easy installation of fittings. #NVH1/4 Add Bracket #Q-BRACKET for best installation. Learn More
    $24.99 Special Price $11.99 As low as $10.39
  2. Omnipure Q5633- Carbon Replacement Prefilter and Post Water Filter-1000
    Omnipure ® Q5633 Carbon Replacement Prefilter and Post Water Filter
    Omnipure ® Q5633 Carbon Replacement Prefilter and Post Water Filter. "Q" Series Quick Connect Sanitary Change. Granular Activated Carbon - T33 GAC Filtration. Learn More
    $27.99 Special Price $18.99 As low as $14.99
  3. Omnipure Q5621- Carbon Replacement Pre-filter and Post-Water Filter- 1000
    Omnipure ® Q5621 Carbon Replacement Prefilter and Post Water Filter
    Omnipure ® Q5621 Carbon Block Replacement Prefilter and Post Water Filter. 10 Micron. Upgrade To Carbon Block From Standard GAC Carbon. No "Carbon Fines" Released. Learn More
    $36.99 Special Price $25.99 As low as $21.99
  4. Omnipure ® TQ56-50FC 50 GPD TFC RO Reverse Osmosis Membrane With Built-In Flow Control
    Omnipure ® TQ56-50FC 50 GPD TFC RO Reverse Osmosis Membrane With Built-In Flow Control
    Omnipure ® TQ56-50FC 50 GPD TFC RO Reverse Osmosis Membrane With Built-In Flow Control. Omnipure Q Series Sanitary Quick Change Replacement RO Reverse Osmosis Membrane. Learn More
    $125.00 Special Price $89.99 As low as $77.99
  5. Omnipure ® TQ56-36FC 36 GPD TFC RO Reverse Osmosis Membrane With Built-In Flow Control
    Omnipure ® TQ56-36FC 36 GPD TFC RO Reverse Osmosis Membrane With Built-In Flow Control
    Omnipure ® TQ56-36FC 36 GPD TFC RO Reverse Osmosis Membrane With Built-In Flow Control. Omnipure Q Series Sanitary Quick Change Replacement RO Reverse Osmosis Membrane. Learn More
    $115.00 Special Price $84.99 As low as $73.99
  6. Omnipure ® TQ56-15FC 15 GPD TFC RO Reverse Osmosis Membrane With Built-In Flow Control
    Omnipure ® TQ56-15FC 15 GPD TFC RO Reverse Osmosis Membrane With Built-In Flow Control
    Omnipure ® TQ56-15FC 15 GPD TFC RO Reverse Osmosis Membrane With Built-In Flow Control. Omnipure Q Series Sanitary Quick Change Replacement RO Reverse Osmosis Membrane. Learn More
    $89.99 Special Price $69.99 As low as $58.99
  7. GGN-Faucet-AG-P-Chrome Air Gap Faucet-Long Reach-1000
    Chrome Air Gap Faucet - Long Reach GGN-FAUCET-AG-P

    Chrome Air Gap Faucet - Long Reach GGN-FAUCET-AG-P.  The perfect replacement faucet for under sink reverse osmosis systems.  Works as air gap or non air gap.  

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    $39.99 Special Price $29.99
  8. 4 Gallon Reverse Osmosis Water Tank Replacement - GGN-Tank-4-Pro 3.2
    4 Gallon Reverse Osmosis Water Tank Replacement - GGN-Tank-4-Pro 3.2

    4 Gallon Reverse Osmosis Tank GGN-Tank-4 Pro 3.2. This is the perfect replacement tank for most RO reverse osmosis systems.   Stainless Steel valve connector.  Perfect replacement for all home RO reverse osmosis drinking water systems.  

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    $79.99 Special Price $49.99
  9. GOES GREEN- Plastic Inversion RO Tank Stand- UPC #850901003408- 1000
    Inversion Tank Stand Reverse Osmosis System

    Inversion Stand for Water Tank on  Reverse Osmosis Systems.  Flip the tank over and remove the weight of the water from the bladder.  Pressure and storage capacity are unchanged.  Extends the life of your reverse osmosis water tank.

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    $27.99 Special Price $17.99
  10. Air Pressure Gauge for Reverse Osmosis Water Accumulator Tanks -1000
    Air pressure gauge for reverse osmosis water accumulator tanks
    Air pressure gauge for reverse osmosis water accumulator tanks - Specially calibrated for reverse osmosis system tanks. Scale from 1 to 20 PSI. Large scale reading over small PSI range allows optimum accuracy. Just like car tires lose air pressure, so does the bladder of your reverse osmosis water accumulator tank. Improper tank air pressure will cause your system to operate improperly. This is a must for all reverse osmosis system owners. Learn More
    $24.99 Special Price $17.99 As low as $12.99
  11. 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 Learn More
    $49.99 Special Price $37.99 As low as $17.99
  12. TDS Meter Inline Water Tester DM1 - HM Digital Dual Mode Reading
    TDS Meter Inline Water Tester DM1 - HM Digital Dual Mode Reading - Easily Installs Inline - Very Simple To Use
    TDS Water Meter - HM Digital DM1 - 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. 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. Dual Range 0-9990 ppm. Always know if your RO membrane is performing correctly! Learn More
    $49.99 Special Price $39.99 As low as $19.99
  13. PuroTwist 4 Stage 50 GPD RO Reverse Osmosis TFC Membrane Quick Change Water Filtration Retro Fit System
    PuroTwist 4 Stage 50 GPD RO Reverse Osmosis TFC Membrane Quick Change Water Filtration Retro Fit System

    PuroTwist 4 Stage 50 GPD TFC Quick Change Water Filtration Retro Fit System.  Quick change head with 50 GPD membrane, Q5605 sediment prefilter, Q-5633 GAC carbon prefilter and post filter No tank, faucet or installation kit. Uses John Guest quick connectors that are very easy to install. Works in place of the ® DuPure or ® Raine "-60" Pure Blue - ® Omnipure -60 "Q" Series systems.  Converts stadard style cartridge RO systems to quick change filters for easier maintenance.

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    $279.99 Special Price $189.99 As low as $154.99
  14. Omnipure Q Series Q53XE Sanitizing Housing
    Omnipure Q Series Q53XE Sanitizing Housing

    Omnipure Q Series Q53XE Sanitizing Housing.  6" empty Q Series quick change filter cartridge used for sanitizing Omnipure, PuroTwist and converted DuPure reverse osmosis and under counter drinking water filtration systems.

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    $9.95
  15. Pro Products Sani System Water Filtration System Sanitizer
    Pro Products Sani System Water Filtration System Sanitizer
    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. Alos NSF certified. 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. Pro Products Sani System Sanitizer. 0.25 fl. oz. concentrate is perfect for your RO reverse osmosis drinking water system sanitizing.. Learn More
    $7.99 Special Price $4.99 As low as $2.49
  16. 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? Learn More
    $5.99 Special Price $3.99 As low as $1.79
  17. Chiller Daddy CHL-750XL Under Sink Water Chiller
    Chiller Daddy CHL-750XL Under Sink Water Chiller

    Chiller Daddy ® CHL-750XL Under Sink Water Chiller -  NEW TANK IS 25% LARGER than our previous chillers.  Output Cold Tank Volume : 3 liter (0.8 gallon) Exterior cabinet is made of RUST FREE 304 SS Stainless Steel. Cold Water Container is made of SUS304 Stainless Steel. Inlets and outlets are 1/4" stainless steel 304. Includes a pair of quick connectors for a simple hook up. Output of Cold Water : 1.34 Gallons Per Hour (5 Liters 5L/H (<10C) Continuous Cold Water Output(cc/hr) 5,400. This is a high output, heavy duty undersink drinking water chiller. Great for use with a Reverse Osmosis System or drinking water filter system.

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    $499.99 Special Price $349.99 As low as $310.99
  18. Inline Water Shut Off Valve-1000
    Inline Water Shut Off Valve - Great For Refrigerators And Ice Machines

    Inline Water Shut Off Valve - Great For Refrigerators, Ice Machines, reverse osmosis systems and under counter drinking water systems.  Built in quick connectors.  Very easy to install and use.

    Quick Fittings and Connector Instructions

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    $14.99 Special Price $9.99 As low as $6.99
Easy TDS Membrane Performance 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 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.

See our selection of TDS meters under Water Tests


Be sure to check our Parts Department for important replacement parts for your Water Doctors PRO-4000 Reverse Osmosis System such as TDS Testers For Reverse Osmosis Membranes, Replacement Tanks, O-rings, Faucets, Pumps, Fittings, UV Systems and more service parts for your reverse osmosis pure water filter system.   View maintenance and servicing tips for Water Doctors drinking water filter system online at our Installation & Trouble Shooting Guide.

* Water Doctors ® is the registered trademark of HMI Water Specialists, Minneapolis, MN USA, the manufacturer of Water Doctors brand drinking water filtration equipment.  The replacement water filters and reverse osmosis membranes listed above are not manufactured or endorsed by HMI Water Specialists.  Rather, these replacement filters and RO membranes are manufactured by other companies.  While these filters and membranes are compatible for use in Water Doctors PRO-4000 reverse osmosis water filtration equipment, we make no representation as to whether using these water filters and RO membranes is consistent with the warranty and specifications applicable to Water Doctors equipment.