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. *For details about our NSF listing, please contact us at [email protected].
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