RO Membrane


New member
How long or how many gallons does a 100GPD last? Reason im asking is its almost a year and i didn't know if i should replace it or not.

I got a 100GPD Vertex and its now reading 01PPM -02PPM but the DI color changing resins are still grey (its not completely exhausted yet)


12-5 Chiefs record
i beleive on a 100gpd membrane you should get about 94-95% rejection rate. you will need to get the TDS levels before and after the membrane and figure out your rejection rate. that will tell you when to change it. my last membrane (75GPD) laster 3.5 years so they can last a while depending on your tap water TDS and changing the prefilters at least every 6 months