Good filters
"Yes, they fit perfectly, although I had to have a Culligan person put them in. . . . ."
RainSoft UF50 Compatible RO Filter Kit with Membrane
Q&As
RainSoft UF50 Compatible RO Filter Kit with Membrane
Q&As
Part Number:
YSM-RSUF50
Make filter changes simple with this complete RainSoft UF50 RO replacement kit—everything you need in one box.
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Subscription Details
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IN STOCK
Description
Filter Replacement filters with RO Membrane compatible with RainSoft UF50 Reverse Osmosis System)
INCLUDES:
- STAGE 1 - 1x Carbon Block Pre Filter (OMB934-5M) - Replace every 6-12 months or as needed
- STAGE 2 - 1x RO Membrane TFC 50 GPD (TFC-RS9-50) - Replace every 24 months
- STAGE 3 - 1x Carbon Block Post Filter (OMB934-5M) - Replace every 6-12 months or as needed
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.
We offer two replacement filter kits so you can get exactly what you need — and avoid paying for filters you don’t.
-
Year 1 Kit found on this page (Includes RO Membrane):
Ideal for your first full replacement, this kit includes all filters plus the RO membrane, which typically lasts up to 24 months. -
Year 2 Kit (Without RO Membrane):
After the first year, you only need to replace the pre- and post-filters, since the RO membrane is still good for another year. This kit helps you save money while keeping your system performing like new.
By offering two kits, we make it easy to follow the recommended replacement schedule and reduce waste — so you only buy what your system truly needs.
*Filters may need to be replaced more often than indicated, depending on water contaminant levels and volume of water being treated.
This Item Fits These Select Systems
Replacements & Add Ons
Replacements for This Item
View All System Parts
Stage 1
Omnipure OMB934-5m Carbon Block Filter 5 Micron 2.5" x 10"
Replace Every 12 Months
See Details
Stage 3
Omnipure OMB934-5m Carbon Block Filter 5 Micron 2.5" x 10"
Replace Every 12 Months
See Details
Customer Reviews
Overall rating: 4.75 / 5 from 24 reviews.
AI Generated Review Summary
The RainSoft UF50 Compatible RO Filter Kit includes all necessary filters for your RainSoft UF50 Reverse Osmosis System. Customers appreciate the prompt delivery and the quality of the filters. The kit offers flexibility for different replacement needs, ensuring your system performs optimally.
Summary topics
- Delivery Speed: 43%
- Filter Quality: 29%
Review topics: ["fit","shipping","system","service","kit","order","filters","received"].
Review highlights
- "Filters delivered promptly and fit exactly." —
- "Filters arrived quickly and work just as well at the "name" brands." —
- "Perfect fit and super fast delivery!" —
Reviews
Good filters
"Yes, they fit perfectly, although I had to have a Culligan person put them in. . . . ."
Great Service
"Perfect fit and super fast delivery!"
Great service and fast delivery
"ESP provides great service and fast delivery. I have been using them for a number of years and am very satisfied."
RO FILTER KIT
"Good fit and works well. Pre filter same as second filter . Fast delivery."
Disappointed
"I received two pre filters and no post filter. I reached out to customer service via e Mail and have received no response."
My search us over!
"I had search for some time to find the correct filters and especially, the membrane. I needed a kind, knowledgeable company as well. ESP WATER and their RainSoft kit is it!"
Rainsoft reverse osmosis replacement filter
"Fit perfectly and worked great! Will buy again for sure!"
RO Filter
"Fit just right."
Just what I needed
"Parts were just what I needed to replace the Rainsoft filters. Fast delivery. would order again"
As advertised
"Easy to find, decent price."
Q&A
Frequently Asked Questions
Q:
Which RainSoft systems fit this UF50 replacement kit?
A:
This aftermarket kit is designed for compatible RainSoft Ultrefiner UF50-family systems, especially pre-2013 UF50 configurations that use conventional replacement cartridges. It does not fit the newer Ultrefiner II proprietary quick-change manifold.
Q:
What is included in the YSM-RSUF50 kit?
A:
The kit includes two Omnipure OMB934-5M 5-micron carbon block cartridges—one prefilter and one postfilter—and one TFC-RS9-50 compatible 50 GPD RO membrane.
Q:
Does this kit include the RO membrane?
A:
Yes. The 50-gallon-per-day compatible membrane is included. This distinguishes YSM-RSUF50 from annual filter-only kits that leave the membrane out.
Q:
How often should the UF50 filters and membrane be replaced?
A:
Replace the carbon block cartridges about every 6 to 12 months and the membrane about every 24 months under typical conditions. High usage, hard water or declining production can require earlier service.
Q:
Is this an original RainSoft kit?
A:
No. It is a compatible replacement kit assembled from quality aftermarket components for supported UF50 systems; it is not manufactured or endorsed by RainSoft.
Q:
What should I check before ordering for an older RainSoft system?
A:
Verify the model label says UF50 or a supported UF50 variant and compare the installed cartridge style and membrane part. If the system has proprietary twist-in filters or is labeled Ultrefiner II, this kit is not the correct direct replacement.
