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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.

LOW PRICES and FAST SHIPPING SINCE 1999 !

99.5% Of All Items In Stock For Same Day Shipping!

3 Stage TFC Reverse Osmosis RO Pure Drinking Water System Help

3 Stage TFC Reverse Osmosis RO Pure Drinking Water System Help

3 Stage TFC Reverse Osmosis System Replacement Water Filters & Membranes

2 vertical filter housings and one top mounted horizontal standard size reverse osmosis RO membrane housing.

Find out how to increase the GPD capacity size of your membrane.

  1. GGN-10-2-1000
    GGN-10-2-Block Premium Quality Carbon Block Replacement Water Filter
    10 Micron Premium Carbon Block Filter. Replaces KX Carbon Block Water Filter # 10-250-190-975 Compatible Replacement. The perfect carbon block for your standard reverse osmosis system. 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. GGN-10-2-BLOCK Learn More
    $12.99 Special Price $9.99 As low as $7.79
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  2. GOES GREEN- Premium 5 Micron Coconut Carbon Block Filter- 1000
    Goes Green 5 Micron Premium Coconut Carbon Block
    Goes Green 5 Micron Premium Extruded Carbon Block Water Filter provides optimal VOC reduction and high chemical absorptive 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
    $23.99 Special Price $15.99 As low as $11.99
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  3. DESAL - TFM-18 RO Reverse Osmosis Membrane #1220188 GE Osmonics -1000
    Desal ® TFM-18/T112-18 RO reverse osmosis membrane # 1220188 GE Osmonics
    Desal ® TFM-18 GE Osmonics - 18 GPD (gallons per day) TFC Style reverse osmosis membrane - Fits Standard Size Membrane Housing. # 1220188. Pentair ® / GE Osmonics ® 18 GPD Thin Film Reverse Osmosis Membrane Model # TFM-18 - Part # 1220188. THE DESAL TFM-18 HAS BEEN DISCONTINUED AND IS NO LONGER AVAILABLE. IF YOU ORDER THE DESAL TFM-18 YOU WILL RECEIVE THE T112-18. Learn More
    $89.99 Special Price $49.99 As low as $39.99
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  4. DESAL TFM-24 RO Reverse Osmosis Membrane #1220189 GE Osmonics Pentair - 1000
    Desal ® TFM-24/Filmtec TW30-1812-24 RO reverse osmosis membrane # 1220189 GE Osmonics Pentair
    Desal ® TFM-24 GE Osmonics - 24 GPD (gallons per day) TFC Style Reverse Osmosis RO Membrane - Fits Standard Size Membrane Housing. # 1220189. Pentair ® /G E Osmonics ® 24 GPD Thin Film Reverse Osmosis Membrane Model # TFM-24 - Part # 1220189. Compatible with Dow Filmtec, WaterFiltersOnline.com and CSM RO Reverse Osmosis membranes. THE TFM-24 HAS BEEN DISCONTINUED AND IS NO LONGER AVAILABLE. IF YOU ORDER THE TFM-24 YOU WILL RECEIVE THE FILMTEC TW30-1812-24. Learn More
    $89.99 Special Price $56.99 As low as $39.99
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  5. DESAL- TFM-36 RO Reverse Osmosis Membrane #1220190 GE Osmonics- 1000
    Desal ® TFM-36 RO reverse osmosis membrane # 1220190 GE Osmonics
    Desal ® TFM-36 GE Osmonics - 36 GPD (gallons per day) TFC style reverse osmosis membrane - Fits Standard Size Membrane Housing. # 1220190 Learn More
    $69.99 Special Price $47.99 As low as $35.99
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  6. DESAL TFM-50 RO Reverse Osmosis Membrane #1204694 GE Osmonics - 1000
    Desal ® TFM-50 RO reverse osmosis membrane # 1204694 GE Osmonics
    Desal ® TFM-50 GE Osmonics - 50 GPD (gallons per day) TFC style reverse osmosis membrane RO - Fits Standard Size Membrane Housing. # 1204694 Learn More
    $69.99 Special Price $49.99 As low as $35.99
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  7. DESAL TFM-75 RO Reverse Osmosis Membrane #1204487 -1000
    Desal ® TFM-75 RO reverse osmosis membrane # 1204487 GE Osmonics
    Desal ® TFM-75 GE Osmonics - 75 GPD (gallons per day) TFC style RO reverse osmosis membrane - Fits Standard Size Membrane Housing. # 1204487 Learn More
    $69.99 Special Price $45.99 As low as $35.99
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  8. DESAL - TFM-100 RO Reverse Osmosis Membrane -1000
    Desal ® TFM-100 RO reverse osmosis membrane # 1221122 GE Osmonics Pentair
    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
    $89.99 Special Price $64.99 As low as $49.99
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  9. Flow_Restrictor-1000
    Inline reverse osmosis membrane flow restrictor
    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
    $33.99 Special Price $19.99 As low as $14.99
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  10. 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
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  11. 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
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  12. 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
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  13. 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
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  14. GGN-Faucet-AG-P-Chrome Air Gap Faucet-Long Reach-1000
    Chrome Air Gap Faucet - Long Reach GGN-FAUCET-AG-P

    LONG REACH, AIR GAP FAUCET IN CHROME

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    $39.99 Special Price $29.99
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  15. 4 Gallon Reverse Osmosis Tank GGN-Tank-4-Pro 3.2
    4 Gallon Reverse Osmosis Tank GGN-Tank-4-Pro 3.2

    4 Gallon Reverse Osmosis Tank GGN-Tank-4 Pro 3.2

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    $79.99 Special Price $49.99
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  16. 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
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  17. Inversion Tank Stand Reverse Osmosis System
    Inversion Tank Stand Reverse Osmosis System

    Inversion Stand for Water Tank on  Reverse Osmosis Systems

    Learn More
    $27.99 Special Price $17.99
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Parts Department
Parts Department

Replacement water faucets, water pumps, tanks, UV, drain saddles, o-rings, wrenches, valves, water accumulator tanks, fittings, TDS meters, water filters, reverse osmosis membrane sparts for reverse osmosis and pure water drinking systems. Buy online.

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Water Chillers
Water Chillers

Chiller Daddy Under Sink Water Chillers for RO reverse osmosis water purification systems - Chiller Daddy CHL-501 to replace Clover C12E. Low prices and fast shipping online since 1999.

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Installation and Trouble Shooting Guide
Installation and Trouble ...

Water Filter System and Reverse Osmosis System Installation and Service Guide. Huge inventory of replacement water filters , reverse osmosis membranes and maintenance service parts. Low prices and fast shipping online since 1999. Millions sold.

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Faucets for RO Reverse Osmosis or Filter Systems
Faucets for RO Reverse ...

Replacement Air Gap Faucets For Reverse Osmosis RO Systems, Pure Water Systems And Water Coolers - TouchFlo Faucets

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Leak Controllers
Leak Controllers

Leak Controller For Reverse Osmosis Systems, Refrigerators, Ice Makers and Coffee Machines - AquaGate

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Tanks
Tanks

Reverse Osmosis Storage Tanks - Water tanks for reverse osmosis drinking water systems. Low prices and fast shipping online since 1999. Millions sold.

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

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 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.

SEE OUR ONLINE HELP GUIDE

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