Filter Replacement Matrix

Filter Packs (carbon & sediment filters) should be replaced every 6-12 months or 750 pure water gallons (375 gallons for inline filters), whichever comes first. Easily add a $20 inline pressure gauge to your system to identify line pressure drops & know exactly when to change your pre-filters.

IF you change your filter on time... your RO membrane (never included in a filter pack), will last 3-5 years or 2-4,000 gallons of pure RO water. Specifically, we replace membranes when they no longer provide at least a 90% rejection rate. To find a membranes rejection rate, we must perform a TDS test of the water quality before and after the membrane. This may sound daunting; however, we are confident you can master performing a TDS test in a few minutes. The TDS meter is similar to a thermometer - one button push and you get your number on the display. Easily add a $30 dual tds meter to your RODI system to know exactly when to change your membrane & deionization resin. For under the sink drinking water systems, we recommend THIS tds meter (under $20). Your membrane works together with your flow restrictor (found on your drain line with a black handle) this number corresponds to your membrane... 550= 50 GPD, 800=75 GPD, 1000=100 GPD, 1100=150GPD, etc... See our fast flush flow restrictors here.