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Water Factory N4000-TFC Water Filters

Water Factory N4000-TFC Water Filters

Water Factory N4000-TFC 3 Stage RO Reverse Osmosis Compatible Premium Replacement Water Filters and RO Reverse Osmosis Membranes

Replacement water faucets, accumulator holding water tanks, water filter cartridges, RO membranes, O-rings, Filter Housing Spanner Wrenches, Valves, Water Pumps and reverse osmosis drinking water system replacement parts.

Water Factory Replacement Water Filters

  1. Regular Price: $28.99

    Special Price $18.99

    As low as: $16.99
    Aqua-Pure AP110 by 3M Purification ® For Premium Performance Filtration - aka AquaPure or Aqua Pure - This Aqua-Pure dirt & rust cartridge is made from an exclusive process using pure white celluose fibers. As water passes from the outer surfaces into the center of the cartridge, the filtering pores become increasingly smaller to remove even microscopic particles. Unlike string-wound and pleated paper cartridges, the rigid, sturdy construction of the Aqua-Pure cartridges are able to withstand high pressure drop and stressful conditions such as water hammer. Cartridge Dimensions: 9 3/4" High x 2 5/8" Diameter Nominal 5 Micron Rating Single Action for Dirt/Rust Graded Density for Long Life (up to 30% longer!) Rigid Construction Withstands Stressful Conditions Hot & Cold Water (up to 100° F) Made from FDA (CFR 21) Compliant Materials Learn More
  2. Regular Price: $22.99

    Special Price $16.99

    As low as: $14.99
    AquaPure AP017 by 3M Purification ® taste, odor, dirt, rust and sediment water filtersRemoves Chlorine, Taste, Odor, Sediment and Rust Learn More
  3. $27.99
    Reduces sediment and chlorine taste and odor for clearer and cleaner drinking water, as well as ice cubes Inline design is ideal for refrigerators, drinking fountains, ice makers, coffee machines and drink dispensers Learn More
  4. 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
  5. Regular Price: $34.99

    Special Price $19.99

    As low as: $16.99
    Standard size RO reverse osmosis membrane housing - 90° Ports with 1/8" FNPT Threads - Includes New O-rings and 3 90° 1/4" Jaco Fittings For 1/4" O.D. Tube. Upgrade to the optional John Guest Quick Connectors. The end with a single port is the inlet feed water. On the end with two ports the center port is the permeate (product) water. The offset port is the brine (waste). Learn More
  6. $19.99
    Flow Restrictor - capillary - 500 ml 1/4' quick connect fittings. "Arrow points to drain". Learn More
  7. Regular Price: $12.99

    Special Price $10.99

    John Guest SCV-CI480821W Check Valve. 1/4" Tube X 1/8" MNPT Fixed Elbow. Learn More
  8. Regular Price: $8.99

    Special Price $4.99

    As low as: $3.29
    AquaPure Drinking Water Filter Housing O-ring #63597174 by 3M Purification. Keep your system from leaking and causing expensive damages by replacing your o-rings every other time you change your water filters. Be sure to order Dow 111 silicone sealant so the o-rings will seal properly. Never use petroleum based greases such as Vasoline. Use the best sealant, use Dow 111 silicone. Learn More
  9. 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
  10. Regular Price: $12.99

    Special Price $8.99

    As low as: $7.49
    AquaPure 68900-34 Adjustable Strap Wrench For Water Filter Housings - Universal Strap Wrench; Works with Most Water Filter Housings. AquaPure 68900-34 Adjustable Strap Wrench: Use for twisting off the canister or sump on many water filter housings. The Adjustable Strap Wrench can be used with many water filtration housings. The strap adjusts to the size of the water filter housing. Do NOT use the AquaPure 68900-34 Adjustable Strap Wrench to tighten the water filter housing sump. Overtightening the sump can cause damage to the o-rings and make re-opening the housing sump difficult. You should only hand tighten the housing sump. The AquaPure 68900-34 Adjustable Strap Wrench makes replacing water filters easy. Learn More
  11. 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
  12. Regular Price: $79.99

    Special Price $49.99

    GGN-Tank-4 - 4 Gallon RO Reverse Osmosis Tank 1/4" NPT Threads. Stainless Steel connector. This is the perfect replacement tank for most residential RO Reverse Osmosis systems. 7 psi Choose White or Blue color. UPC #850901003491 Learn More
  13. 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
  14. Regular Price: $69.99

    Special Price $49.99

    As low as: $29.99
    TDS Meter Dual Mode Readings - Professional Grade - Easily Installs Inline - Very Simple To Use. Measure the tap water coming in vs. the purified water going out of your system at any time. Use the meter to determine when the filters need to be changed. Highly efficient and accurate due to its advanced microprocessor technology. Displays TDS levels of the Feed Water and Product Water with in & out electrode probes. Auto-Off function conserves battery power. The unit shuts off automatically after 20 seconds. Dual Range - Measures from 0-999 ppm, with a resolution of 1 ppm. Learn More
  15. Regular Price: $29.99

    Special Price $20.99

    As low as: $16.99
    Auto Shut Off RO 1 With Quick Connections- Automatic shutoff valve for reverse osmosis systems. ASO ASV Easy to use 1/4" OD Tube with quick connections. The valve automatically shuts off production when the tank pressure reaches approximately 65% of the incoming line pressure. Learn More
  16. 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
  17. 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

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 MembranesReplacement TanksO-rings , Filter Housing WrenchesFaucetsPumpsFittingsUV Systems and more parts for your reverse osmosis pure water filtration system.   View maintenance and servicing tips online at our Installation & Trouble shooting Guide.

* WATER FACTORY ® IS THE REGISTERED TRADEMARK OF 3M FILTRATION, THE MANUFACTURER OF WATER FACTORY ® BRAND WATER TREATMENT EQUIPMENT. THE REPLACEMENT FILTERS AND MEMBRANES LISTED ABOVE ARE MANUFACTURED BY 3M WATER FACTORY AS SO NOTED. WATER FACTORY REVERSE OSMOSIS DRINKING WATER SYSTEMS WERE ALSO MANUFACTURED AND SOLD UNDER THE CUNO BRAND NAME. WE ALSO OFFER COMPATIBLE REPLACEMENT SEDIMENT WATER FILTERS, REPLACEMENT CARBON BLOCK WATER FILTERS, GAC CARBON FILTERS, INLINE POST FILTERS, RO REVERSE OSMOSIS MEMBRANES, PRE FILTERS, FAUCETS, WATER TANKS, VALVES, PUMPS, UV ULTRAVIOLET AND WATER TESTING SUPPLIES FROM VARIOUS OTHER MANUFACTURERS FOR DISCONTINUED CUNO WATER FACTORY DRINKING WATER SYSTEMS.

3M Water Filter Distributor