The AP5500RM replacement module should be changed every 3-5 years, depending on feed water quality. The product water total dissolved solids (TDS) should be at least 85% lower than the feed water TDS. A TDS meter can accurately measure this. If unavailable, send a sample of the feed water and product water to:
Pavel Water Filtration 70 Windsor St. West Springfield, Ma. 01089
A minimum of 6 ounces per sample is needed.
Specifications: 25 Gallons Per Day :: Thin Film Composite Construction :: Module and Housing Self Contained as One Unit for Sanitary Handling.