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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Filter Direct Water Filters ®

Filter Direct Water Filters ®

Filter Direct Compatible Replacement Water Filters & Reverse Osmosis Membranes

Filter Direct RO-316

Filter Direct RO-435

Filter Direct RO-535

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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.