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"If there be any among us who [disagree], let them stand undisturbed as monuments of the safety with which error of opinion may be tolerated, where reason is left free to combat it." Thomas Jefferson, March 4, 1801
Guaranteed Genuine Dupont Filmtec Model TW30-1812-100HR Reverse Osmosis Membrane. This is a direct replacement for many RO units, including "The Filter Guys" dual membrane, double pass RO units sold online. Except these are 100GPD instead of 75GPD. (Gallons Per Day). If you are retrofitting a 75GPD membrane with this 100GPD membrane you may have to change your or adjust your bypass. (The 75GPD membrane from "The Filter Guys" came with a 550 orifice. We have used these membranes with a 500 and 600 orifice with no problems.) Beware counterfeit products. They are out there. Sealed in original Filmtec sealed bag. Shipped dry for long shelf life, stock up! :)