Rainsoft Ultrefiner II 3-Stage RO Conversion Kit Filters

The Rainsoft Ultrefiner II reverse osmosis drinking water system uses expensive proprietary filters that offer few benefits over traditional RO systems, and the filters can only be purchased directly from a Rainsoft authorized dealer. 

Alternative Option to Rainsoft Ultrefiner II Filters: To reduce costs, save water, and produce purified water faster, consider converting your Rainsoft system to the PuROTwist Retrofit Kit (PT4000T75-RK). This conversion kit allows you to use PuROTwist filters with your existing Rainsoft faucet, tank, and tubing. Start saving on replacement filters today!

IMPORTANT: The PuROTwist filter kits below only work if you convert your Rainsoft system with the PuROTwist Retrofit Kit (PT4000T75-RK).