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.

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Filmtec Dow Commercial Reverse Osmosis Membranes ®

Filmtec Dow Commercial Reverse Osmosis Membranes ®

Dow Filmtec ® commercial & industrial reverse osmosis membranes

See Residential Dow Filmtec reversers osmosis membranes

  1. Dow Filmtec 4"×40" SW30-4040
    Dow Filmtec SW30-4040 Sea Water RO Reverse Osmosis Membrane
    FILMTEC DOW SW30-4040 membrane elements have the highest flow rates available to meet the water demands of both sea-based and land-based . FILMTEC SW30-4040 elements may also be operated at lower pressure to reduce pump size, cost and operating expenses. SW30-4040 by Dow is a 4"-40" Length with a flow rate of 1,950 Gal/Day with a pressure of 800 PSI and Stabilized Salt Rejection rate of 99.4%. Filmtec TW30-4040 is the industry standard for reliable operation and production of the highest quality water.
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    $482.50 Special Price $473.00 As low as $429.00
  2. FILMTEC XLE-2521 RO Reverse Osmosis Membrane Element
    FILMTEC XLE-2521 RO Reverse Osmosis Membrane Element

    FILMTEC XLE-2521 RO Reverse Osmosis Membrane Element

    FILMTEC™ XLE-2521 Elements offer better system performance and economics for small commercial systems by operating at very low applied pressure. FILMTEC XLE-2521 elements are tape-wrapped. In addition to high quality water and low energy costs, FILMTEC membranes also deliver savings by providing long lasting and reliable performance.

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    $279.95 Special Price $199.95
  3. Pro Products Sani System RO & Water Filtration System Sanitizer
    Pro Products Sani System RO & 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..
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    $7.99 Special Price $4.99 As low as $2.99
  4. 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!
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    $49.99 Special Price $39.99 As low as $19.99
  5. 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

Easy TDS Membrane Performance 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 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.


* Dow Filmtec ® is the registered trademark of Dow Filmtec, the manufacturer of Dow Filmtec ® brand water treatment equipment.  The replacement filters and membranes listed above are not manufactured or endorsed by Dow Filmtec.  Rather, these filters and membranes are manufactured by other companies.  While these filters and membranes are compatible for use in Dow Filmtec ® 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 Dow Filmtec ® equipment.