- Rainsoft Ultrefiner 21173 Reverse Osmosis System Replacement Water Filters:
- We distribute compatible water filters for the Rainsoft 21173 Ultrefiner Reverse Osmosis System.
- The Rainsoft 21173 RO System has three separate filtration stages.
We distribute compatible filters for the Rainsoft 21173 Reverse Osmosis System.
Stage 1:
P5 Stage 2:
CTA-RS9-10 Stage 3:
EPM-10 See the Replacements tab above for more information on each stage and the compatible filters for each stage.
These filters can be purchased below.
- Manufacturer: Rainsoft 21173
- Rainsoft 21173 Reverse Osmosis System Stages:
- Stage 1: The P5 5 Micron Sediment Water Filter is used in the first housing. The Stage 1 filter should be changed every 2-6 months. Rainsoft Part # 13110 & 17367 Compatible.
- Stage 2: The CTA-RS9-10 reverse osmosis membrane is the 2nd stage. The Stage 2 membrane should be changed every 1-3 years. Rainsoft Part # 12446 & 17376 Compatible.
- Stage 3: The EPM-10 10 Micron Carbon Block water filter is the 3rd stage. The Stage 3 filter should be changed every 6-12 months. Rainsoft Part # 12464, 13119, 17368, 18557 Compatible.
- Rainsoft 21173 Reverse Osmosis System Parts & Accessories:
- Order the OR-38 replacement o-rings for the three slim line reverse osmosis housing sumps.
- Rainsoft 21173 Water Filter Change Intervals:
- The filter change interval will vary due to your water quality and the amount of water used.
We are not authorized to sell the genuine Rainsoft filters, but we sell compatible Rainsoft filters. Note that you can only use genuine Rainsoft filters in your system in order to maintain the original manufacturer's warranty.
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