50GPD RO Membrane – Stage 4


  • 50 Gallons Per Day (GPD) reverse osmosis membrane
  • Rejects impurities in water down to 0.0001 micron
  • Stage 4 replacement filter for OROS-50
  • High-quality TFC (Thin Film Composite) membrane
  • Industry standard sized membrane

In stock

Olympia Water Systems 50GPD reverse osmosis membrane is a stage-4 replacement filter for the OROS-50. The high-quality TFC (Thin Film Composite) membrane rejects impurities in drinking water down to 0.0001 micron. The membrane is also industry standard sized to fit in most under-sink reverse osmosis systems. Removes Arsenic, Barium, Cadmium, Chromium (Hexavelent & Trivalent), Copper, Turbidity, Fluoride, Lead, Radium 226/228, Selenium* & TDS. *These claims are based on manufacturer testing. These claims are not certified by NSF.

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30 Day Money-Back Guarantee

Olympia Water System products have a 30 day money-back guarantee from the date of purchase. All return shipping fees are the customer’s responsibility unless the return is due to manufacturer error or defect. For details on our Return Policy and Product Warranty please visit our Terms & Conditions and Warranty pages.


We ship to addresses within the United States (48 continental states, Alaska, Hawaii & Puerto Rico). Shipments within the 48 continental states will be shipped via UPS Ground or USPS. Shipments to Alaska, Hawaii & Puerto Rico will be shipped via USPS only. Shipping discounts are only applicable to orders with shipping addresses located in the 48 continental states of the United States. In-stock items will be shipped within 2-3 business days after your order has been placed. Please inspect shipments for damage at the time of delivery.

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