Reverse Osmosis Systems

Rainsoft Ultrefiner UF50 3-Stage RO Compatible Replacement Filters

If your Rainsoft Ultrefiner UF50 RO System is due for filter replacements and your system was manufactured prior to 2013, we offer high-quality compatible filters for this system. The compatible filter kits can be found below.

For UF50 reverse osmosis drinking water systems made after 2013, it's likely the Ultrefiner II model, which uses expensive proprietary filters that offer limited advantages compared to compatible filters.

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

Replacement Filter Info

Carbon Block Filter (OMB934-5M - Rainsoft Part#: 18557 or 9557) – Replace every 6-12 months or as needed

RO Membrane TFC 50 GPD (TFC-RS9-50 - Rainsoft Part#: 18644, 9568, 18571, 12447, 21176, M-T1810R50) – Replace every 24 months or as needed

Carbon Block Filter (OMB934-5M - Rainsoft Part#: 18557 or 9557) – Replace every 6-12 months or as needed

Helpful Filter Information

Not all filters have the same replacement schedule. Replace the RO membrane filter every two years. Replace all other filters every 6-12 months. Help keep your system sanitary by never using filters longer than 12 months, except the RO membrane filter, regardless of how much water you use.

Filter Replacement Schedule

We’ve taken the guesswork out of replacing your filters. Begin a filter replacement cycle by replacing all filters on your system (Filter Kit "YSM"). The following year, or sooner if recommended by the manufacturer, replace all filters except the RO membrane (Filter Kit "YS"). Repeat this cycle by following the helpful diagram below.