Toggle Nav
Save With Quantity Discounts On Replacement Water Filters and Reverse Osmosis Membranes
Cart ()
Order Tracking

Low Prices and Fast Shipping

Since 1999

Toggle Nav
Cart ()
Order Tracking
Search
Advanced Search
Menu
Menu
Account

xxx 4 Stage Reverse Osmosis Water Filters

xxx 4 Stage Reverse Osmosis Water Filters
xxx 4 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.
  1. AquaPure AP110 by 3M Purification ® Fine / Normal Sediment Water Filters - 55410-14 - 2 Pack - 5 Micron Nominal
    AquaPure AP110 by 3M Purification ® Fine / Normal Sediment Water Filters - 55410-14 - 2 Pack - 5 Micron Nominal
    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. Reduces sediment Average life: 6 months (incoming water quality may affect cartridge life) Proprietary polypropylene manufacturing process Grooved surface increases total surface area for longer cartridge life than non-grooved filter cartridges Rigid construction helps to eliminate sediment “unloading” due to variances in water pressure System materials are FDA CFR-21 compliant
    Learn More
    $28.99 Special Price $18.99 As low as $16.99
    Add to Wish List Add to Compare
  2. AquaPure AP017 by 3M Purification ® taste, odor, dirt, rust and sediment water filters
    AquaPure AP017 by 3M Purification ® taste, odor, dirt, rust and sediment water filters
    AquaPure AP017 by 3M Purification ® taste, odor, dirt, rust and sediment water filters Removes Chlorine, Taste, Odor, Sediment and Rust
    Learn More
    $22.99 Special Price $16.99 As low as $14.99
    Add to Wish List Add to Compare
  3. Aqua-Pure 3M-IL-IM-01
    AquaPure 3M IL-IM-01 Inline GAC Water Filter
    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
    $27.99
    Add to Wish List Add to Compare
  4. DOW FILMTEC - TW30-1812-50 RO Reverse Osmosis Membrane #80722-1000
    Dow Filmtec ® TW30-1812-50 RO reverse osmosis membrane # 80722
    Dow Filmtec ® TW30-1812-50 TFC 50 GPD RO reverse osmosis membrane - standard size 1.75" X 11.75" Part # 80722
    Learn More
    $84.99 Special Price $69.99 As low as $54.99
    Add to Wish List Add to Compare
  5. Standard Size RO Reverse Osmosis Membrane Housing
    Standard Size RO Reverse Osmosis Membrane Housing
    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" Tube, or upgrade to the 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
    $34.99 Special Price $19.99 As low as $16.99
    Add to Wish List Add to Compare
  6. Flow_Restrictor-500 Flow Restrictor - capillary - 500 ml 1/4' quick connect fit-1000
    Flow Restrictor - Inline - 500 ml 1/4' quick connect fit...

    Flow Restrictor - capillary - 500 ml 1/4" quick connect fittings. 

    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
    $19.99
    Add to Wish List Add to Compare
  7. JOHN GUEST- SCV-CI40821W- 1000
    John Guest SCV-CI480821W Check Valve 1/4" Tube X 1/8" MNPT
    John Guest SCV-CI480821W Check Valve. 1/4" Tube X 1/8" MNPT Fixed Elbow.
    Learn More
    $12.99 Special Price $10.99
    Add to Wish List Add to Compare
  8. AquaPure Drinking Water Filter Housing O-ring #63597174 by 3M CUNO
    AquaPure Drinking Water Filter Housing O-ring #63597174 by 3M Purification
    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
    $8.99 Special Price $4.99 As low as $3.29
    Add to Wish List Add to Compare
  9. 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
    Add to Wish List Add to Compare
  10. AquaPure 68900-34 Adjustable Strap Wrench For Water Filter Housings
    AquaPure 68900-34 Adjustable Strap Wrench For Water Filter Housings
    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
    $12.99 Special Price $8.99 As low as $7.49
    Add to Wish List Add to Compare
  11. 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
    Add to Wish List Add to Compare
  12. 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.  

    Learn More
    $79.99 Special Price $49.99
    Add to Wish List Add to Compare
  13. 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
    Add to Wish List Add to Compare
  14. TDS Water Meter Dual Mode Readings - DM2 HM Digital Professional Grade
    TDS Water Meter Dual Mode Readings - DM2 HM Digital Professional Grade - Easily Installs Inline - Very Simple To Use
    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
    $69.99 Special Price $49.99 As low as $29.99
    Add to Wish List Add to Compare
  15. Automatic Shut Off Valve with quick connections for reverse osmosis RO system - ASO ASV
    Automatic Shut Off Valve with quick connections for reverse osmosis RO system - ASO ASV
    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
    $29.99 Special Price $20.99 As low as $16.99
    Add to Wish List Add to Compare
Parts Department
Parts Department

Water Filter System Parts Department. Find replacement filters, reverse osmosis membranes and repair parts in stock for prompt shipping. Water Filter System Parts For Your 3M, Aqua-Pure, CUNO or Water Factory Reverse Osmosis Systems, Under Sink Water Filters and Whole House Water Filtration. Low prices and fast shipping online since 1999.

More
Water Testing
Water Testing

Water Testing, TDS Meters and Water Test Supplies. Large selection, low prices and fast shipping online since 1999.

More
Designer Faucets
Designer Faucets

Replacement Faucets for 3M, CUNO, Aqua-Pure and Water Factory RO Reverse Osmosis and Under Sink Pure Drinking Water Filter Systems. Huge selection of styles and finishes in stock. Low prices and fast shipping online since 1999.

More
Under Sink Water Chillers
Under Sink Water Chillers

Chiller Daddy Under Sink Water Chillers - Enjoy chilled water from your Aqua-Pure, CUNO, Water Factory or 3M RO Reverse Osmosis or drinking water filtration system. Perfectly chilled water at your tap. Large selection, low prices and fast shipping since 1999.

More
3M Gift Guide
3M Gift Guide

Water Factory, 3M, CUNO and AquaPure replacement water treatment equipment supplies. Huge inventory of replacement parts, water filters and reverse osmosis membranes. Low prices and fast shipping since 1999.

More
Tube - Poly Tubing
Tube - Poly Tubing

John Guest Poly Tube for RO Reverse Osmosis and Water Filter Pure Drinking Water Filtration Systems. Large John Guest tubing inventory, low prices and fast shipping since 1999.

More

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

* 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.
Parts Department

Problem Water Filters

SEE OUR ONLINE HELP GUIDE

Compare Products
  1. Remove This Item
Compare
Clear All
You have no items to compare.
My Cart

  1. ​

Filter Change Email Reminder

My Wish List
Last Added Items
  1. Add to Cart
    Remove This Item
Go to Wish List
You have no items in your wish list.