Rainsoft 21179 3-Stage RO Compatible Replacement Filters

The Rainsoft 21179 features a 1 micron carbon block prefilter, a 50 GPD TFC membrane, and another 1 micron carbon block for the post filter. The Rainsoft 21179 uses a carbon block pre-filter to reduce sediment, chlorine, and chlorine by-products before the membrane filters out impurities larger than .001 microns. The carbon block post filter treats for taste and odor. These filters are high-quality aftermarket RO filters that will produce outstanding drinking water. Note: If your Rainsoft reverse osmosis system is from 2013 or newer, it most likely is the Ultrefiner II. The Ultrefiner II requires proprietary filters that must be purchased from a Rainsoft dealer. Conversion kits to generic non-OEM replacement filters are available.