Reverse Osmosis System - When to Change the Membrane

When the TDS (total dissolved solids) reduction of the system falls below 75%, it is time to replace the reverse osmosis cartridge/membrane in addition to the prefilter and postfilter. The TDS should be checked annually. Replace the membrane if the TDS falls below 75% reduction or maximum every 3-5 years as needed.

A water test kit can be obtained from an independent laboratory to check the TDS reduction. For information on the water test kit, please consult your Owner' Manual.

Note: We do not recommend another manufacturer’s membrane or filters.