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 ONLINE SINCE 1999 !

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

3M Reverse Osmosis Systems

3M RO Reverse Osmosis Systems 3MRO301, 3MRO401 AND 3MRO501
3MROP310, 3MROP316, 3MROP411, 3MROP412, 3MROP416 Replacement Filters
and 3MROM413 RO Membrane

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

A History of Innovation

For more than a century, 3M has applied innovation and technology to improving their customers' lives and supporting their business goals. Today the company, from its headquarters in St. Paul, Minnesota, serves industrial and commercial customers and consumers in nearly 200 countries. The 3M brand, across thousands of products, represents consistency, superior quality, and value. 3M's success begins with its culture of creative collaboration that inspires a never ending stream of powerful technologies and product solutions that make life better. 3M has an ability to apply technologies — often in combination — to an endless array of real-world customer needs. Of course, all of this is made possible by the people of 3M, and their singular commitment to make life easier and better for people around the world. 3M is committed to providing innovative, cost-effective products that help protect people, equipment, and our environment. 3M Purification Inc. (formerly CUNO Incorporated), provides filtration and separation solutions for residential, food service, science labs, industrial, marine, and other applications.

* 3M PURIFICATION ® IS THE REGISTERED TRADEMARK OF 3M INC., THE MANUFACTURER OF 3M PRO, SQC, WATER FACTORY, CUNO, AQUA-PURE ® BRANDS OF RO REVERSE OSMOSIS, 3M FULL FLOW SYSTEMS, 3M WHOLE HOUSE SYSTEMS, 3M UNDER SINK DRINKING WATER SYSTEMS, 3M DEDICATED FAUCET SYSTEMS, AQUA-PURE REFRIGERATOR AND ICE MAKER FILTERS, OCS COFFEE AND RELATED WATER TREATMENT EQUIPMENT. AKA AQUAPURE, COOLER MATE, FAUCET MATE, 3M PRO and SQC SANITARY QUICK CHANGE