AquaFX The leaders in reverse osmosis. The AquaFX 1000 GPD Membrane Flows 1000 GPD of product water @100PSI 77 Degrees F Able to achieve 1:2 water water ratio (Water Quality permitting) Replacement Membrane for the AquaFX Blue Marlin 98% Stabilized Salt Rejection Rate 4 X 21 TFC Made in the USA!