Save With Quantity Discounts On Replacement Water Filters and Reverse Osmosis Membranes

Purwater CUNO PW-RO4L Reverse Osmosis Replacement Water Filters

Purwater CUNO PW-RO4L Reverse Osmosis Replacement Water Filters

PurWater TFM50EM 50 GPD RO Reverse Osmosis Membrane CUNO Purwater PW-RO4L RO Reverse Osmosis Compatible Premium Replacement Water Filters and RO Reverse Osmosis Membranes

This system was Discontinued Apr 03, 2013, but we still have 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 to keep your RO system going for many years. 

CUNO Purwater PW-R04L - 5 Stage RO System:
• Ideal for municipal or well suppl ied water.
• Melt blown graded density prefilters provide sediment reduction for a wide variety
of particle sizes, extending membrane life.
• Premium activated carbon reduces chlorine taste and odor.
• Encapsulated RO membrane reduces arsenic, copper and other metals, lead,
turbidity and other contaminants.
• In-line carbon post filter provides a final water "polish"
• Temperature: 40° -104° F (44° - 40° C).
• Pressure: 20 - 90 PSI (137.9 - 620.5 kPa).

ORDER THE FOLLOWING REPLACEMENTS FOR YOUR PUREWATER PW-RO4L SYSTEM:

PurWater MB20-S 20 Micron Sediment Pre Filter
PurWater MB05-S 5 Micron Sediment Pre Filter
PurWater GAC10 Granular Activated Carbon Filter
PurWater TFM50EM 50 GPD RO Reverse Osmosis Membrane  (NOTE-Membrane housing must be replaced.  OEM housing will not open to accept a new RO membrane.  You will also need to order the matching flow restrictor and check valve below.)
PurWater IL-T02-S Inline Post Filter

  1. OMNIFILTER RS12-DS ® Whole House 20 Micron String Wound Water Filter Twin Pack

    Regular Price: $17.99

    Special Price $9.99

    As low as: $8.69
    OMNIFILTER RS12 ® Whole House 20 Micron String Wound Water Filter. Flow Rate 5 gpm. 24 per case. Priced and sold individually. Order a full case of 24 and save even more. Learn More
  2. AquaPure AP110 by 3M Purification ® Fine / Normal Sediment Water Filters - 55410-14 - 2 Pack - 5 Micron Nominal

    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.Reduces sedimentAverage life: 6 months (incoming water quality may affect cartridge life)Proprietary polypropylene manufacturing processGrooved surface increases total surface area for longer cartridge life than non-grooved filter cartridgesRigid construction helps to eliminate sediment “unloading” due to variances in water pressureSystem materials are FDA CFR-21 compliantLearn More
  3. KX Matrikx ® 10/2 Carbon Block Water Filter # 10-250-190-975 Replacement-1000

    Regular Price: $17.99

    Special Price $9.99

    As low as: $6.99
    KX Matrikx ® 10/2 Carbon Block Water Filter # 10-250-190-975 Compatible Replacement. If you order the 10/2 you will receive the CTO/2 as the new replacement as the KX 10/2 has been discontinued by KX Industries. KX Matrikx ® 10/2 # 10-250-190-975 10 Micron nominal and 3 Micron minimum 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. AquaPure AP017 by 3M Purification ® taste, odor, dirt, rust and sediment water filters

    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
  5. DOW FILMTEC - TW30-1812-50 RO Reverse Osmosis Membrane #80722-1000

    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 More
  6. Standard Size RO Reverse Osmosis Membrane Housing

    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" 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
  7. Flow_Restrictor-500 Flow Restrictor - capillary - 500 ml 1/4' quick connect fit-1000
    $19.99
    Flow Restrictor - capillary - 500 ml 1/4' quick connect fittings. "Arrow points to drain". Learn More
  8. JOHN GUEST- SCV-CI40821W- 1000

    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
  9. AquaPure Drinking Water Filter Housing O-ring #63597174 by 3M CUNO

    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
  10. Molykote-From DOw Corning- 111 Compound-6 Gram O-ring Silicone Lubricant & Sealant-Dow-111-5-gram-1000

    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? Learn More
  11. AquaPure 68900-34 Adjustable Strap Wrench For Water Filter Housings

    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
  12. Pro Products Sani System Water Filtration System Sanitizer

    Regular Price: $7.99

    Special Price $4.99

    As low as: $2.49
    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
  13. TDS Meter - Test For Total Dissolved Solids In Water - Reverse Osmosis Membrane Tester - TDS Meter

    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 Learn More
  14. TDS Meter Inline Water Tester DM1 - HM Digital Dual Mode Reading

    Regular Price: $49.99

    Special Price $39.99

    As low as: $19.99
    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
  15. Amtrol ® RO 4 RO Replacement Reverse Osmosis Water Accumulator Tank

    Regular Price: $79.99

    Special Price $59.99

    As low as: $49.99
    Amtrol ® RO 4 RO Replacement Tank for Reverse Osmosis Water Systems. 4.4 Gallon (15" high X 11" diameter - including base) SS Stainless Steel Connection Stem - Connection Size: 1/4" MNPT - Valve Optional Learn More
  16. Air Pressure Gauge for Reverse Osmosis Water Accumulator Tanks -1000

    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. Automatic Shut Off Valve - With Quick Connections for Reverse Osmosis RO System - ASO ASV - 2000

    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

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.

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