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

Hague Water Filters ®

Hague Water Filters ®

Hague Performance Compatible Replacement Water Filters & TFC Reverse Osmosis Membranes

Hague 5 Stage Reverse Osmosis System

5 Stage System - 3 vertical filter housings, one top mounted horizontal inline GAC carbon post filter and one top mounted standard size

horizontal RO membrane housing. The system uses quick connectors at all connection points. See how to use quick connectors.


The Hague H3500 Reverse Osmosis system uses the same filters as the 5 stage system, but with one less carbon block prefilter.

  1. Regular Price: $99.99

    Special Price $69.99

    As low as: $55.99
    Aquatec ® Permeate Pump - The Aquatec ERP-1000 permeate pump is a turbine pump that uses the pressure of the waste water to pump the product drinking water into the storage tank. This protects the membrane from the back flow pressure of the tank, maintaining maximum osmotic pressure at all times. Great for low pressure applications. • Increases product water purity • Increases pressure and flow to the faucet • Saves up to 3/4 of inlet water • Up to 30% more tank pressure • Faster tank refill recovery • Increases filter and membrane life • Requires no electricity • Mounting Clip Supplied. Order the optional auto shut off valve that triggers at 90 percent rather than the standard 66 percent of tank pressure versus incoming line pressure. While the permeate pump works fine with a standard 66 percent auto shut off valve, the 90 percent valve increases storage capacity of the tank and increases initial pressure from the faucet. Will not install on most manifold systems such as Hydtrotech and Water Factory. Learn More
  2. Regular Price: $8.99

    Special Price $5.99

    As low as: $3.99
    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
  3. Regular Price: $12.99

    Special Price $9.99

    As low as: $7.79
    GGN-10-2-BLOCK Premium 10 Micron Carbon Block Filter. Replaces KX Carbon Block Water Filter # 10-250-190-975 Compatible Replacement. 10 Micron nominal Extruded Carbon Block Water Filter. 9 3/4" long X 2 1/2" diameter OD X 1 1/4" diameter ID. 20 per case, sold individually. Order a case and save even more. Learn More
  4. Regular Price: $23.99

    Special Price $15.99

    As low as: $11.99
    Goes Green 5 Micron Premium Extruded Carbon Block Water Filter provides optimal VOC reduction and high chemical adsorptive capacity. 9 3/4" 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 More
  5. Regular Price: $69.99

    Special Price $44.99

    As low as: $35.99
    Desal ® TFM-18 GE Osmonics - 18 GPD (gallons per day) TFC Style reverse osmosis membrane - Fits Standard Size Membrane Housing. # 1220188 Learn More
  6. Regular Price: $89.99

    Special Price $56.99

    As low as: $37.99

    Dow Filmtec ® TW30-1812-24 24 GPD TFC RO reverse osmosis membrane - standard size 1.75" X 11.75" Part # 93430

    Learn How To Upgrade Your Reverse Osmosis Membrane Capacity

    Learn More
  7. Regular Price: $99.99

    Special Price $59.99

    As low as: $39.99
    Dow Filmtec ® TW30-1812-36 TFC 36 GPD RO reverse osmosis membrane - standard size 1.75" X 11.75" Part # 80719 Learn More
  8. Regular Price: $84.99

    Special Price $69.99

    As low as: $54.99
    Dow Filmtec ® TW30-1812-50 TFC 50 GPD RO reverse osmosis membrane - standard size 1.75" X 11.75" Part # 80722 Learn How To Upgrade Your Reverse Osmosis Membrane Capacity Learn More
  9. Regular Price: $119.99

    Special Price $74.99

    As low as: $49.99
    Dow Filmtec ® TW30-1812-75 (BW60-1812-75) TFC 75 GPD RO reverse osmosis membrane - standard size 1.75" X 11.75" Part # 114731 Learn More
  10. Regular Price: $89.99

    Special Price $64.99

    As low as: $49.99
    Desal ® TFM-100 GE Osmonics - 100 GPD (gallons per day) TFC Style RO reverse osmosis membrane - Fits Standard Size Membrane Housing. # 1221122. Pentair ® / GE Osmonics ® 100 GPD Thin Film Reverse Osmosis Membrane Model # TFM-100 - Part # 1221122. Compatible replaccement for Dow Filmtec, WaterFiltersOnline.com and CSM RO Reverse Osmosis membranes. Learn More
  11. Regular Price: $129.99

    Special Price $84.99

    As low as: $59.99
    Dow Filmtec ® TFC 100 GPD RO reverse osmosis membrane - standard size 1.75" X 11.75" Extra fast recovery and high production flow rate.

    Learn How To Upgrade Your Reverse Osmosis Membrane Capacity

    Learn More
  12. Regular Price: $33.99

    Special Price $19.99

    As low as: $14.99
    Premium inline reverse osmosis membrane flow restrictor - Our in-line capillary flow restrictors are simple to install. Simply push the 1/4" poly tube firmly into the quick connectors and you are done. Be sure that you order the flow restrictor size to match your reverse osmosis membrane size. Arrow on side points toward the drain. Very simple to install. Learn More
  13. 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
  14. 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
  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: $79.99

    Special Price $49.99

    GGN-Tank-4- 4 Gallon RO Reverse Osmosis Tank 1/4" NPT Threads 7 psi White color. UPC #850901003491 Learn More
  18. Regular Price: $24.99

    Special Price $17.99

    As low as: $12.99
    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
  19. Regular Price: $27.99

    Special Price $17.99

    Protect the bladder of your tank by using our tank inversion stand. Most tanks hold the water in the top portion of the tank instead of the bottom. Storing the water on top of the bladder adds the weight of the water to the pressure to cause unnecessary stress on the bladder. By inverting (turning upside down) it removes the weight of the water on the seal where the bladder is attached to the inside of the tank. Fits most standard 3 and 4 gallon tanks. Plastic Inversion RO Tank Stand. UPC #850901003408 Learn More
  20. Regular Price: $10.99

    Special Price $9.99

    As low as: $7.99
    Goes Green GGN-GAC-10 Granular Activated Carbon Water Filter UPC#850901003354 Learn More
  21. Regular Price: $21.99

    Special Price $11.99

    As low as: $9.49
    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
  22. Starting at: $5.99

    5 Stage Replacement Water Filter Kit 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.


* Hague ® is the registered trademark of Hague, the manufacturer of Hague ® brand water treatment equipment.  The replacement filters and membranes listed above are not manufactured or endorsed by Hague.  Rather, these filters and membranes are manufactured by other companies.  While these filters and membranes are compatible for use in Hague ® brand water treatment equipment, we make no representation as to whether using these filters and membranes is consistent with the warranty and specifications applicable to Hague ® equipment.