Complete four-filter RO replacement set with the Sediment + Carbon pre-filter and a PCB polishing stage, for compatible systems with 1/4-inch push-fit connections.
Your order includes a free filter flushing kit.
Optional add-ons
Both remain separate from the filter-set subscription.
Faster installation
Faster filter changes—without tools or broken fingernails.
Added protection
Automatically shuts off the water supply when its detection pad gets wet, helping prevent water damage from a small leak. Comes with 2 pads (1 installed, 1 spare inside the unit).
The four-filter sequence
Four filters work as one coordinated system. Combination filters may provide more than one treatment stage within a single cartridge.
Two stages in one filter: sediment filtration captures rust, dirt and pipe residue, then an activated carbon block helps reduce chlorine and organic compounds.
Granular activated carbon helps reduce chlorine and organic compounds while helping protect the RO membrane.
Reverse osmosis for dissolved solids reduction.
PCB combines activated carbon adsorption with 1 micron physical filtration.
This set is for compatible four-filter reverse osmosis systems that use 2.5-inch-diameter filters with 1/4-inch push-fit connections and have room for 12-inch-tall filters. These filters are not compatible with twist-on systems. Confirm the installed filter style before ordering.
| Set type | Four-filter RO replacement set |
|---|---|
| Physical configuration | 4 replacement filters |
| Treatment stages | Varies by filter configuration; combination filters may provide more than one stage |
| Included filters | Sediment + Carbon, Pre Carbon, RO Membrane, and PCB Polishing Filter |
| Filter format | 12 inches tall × 2.5 inches in diameter, I-type |
| Connections | 1/4-inch push-fit |
| Replacement schedule | Approximately every 12 months; lifespan varies with usage and source-water quality |
| Housing / origin | Polypropylene / Made in Korea |
Sediment + CarbonTwo-stage sediment and carbon block pre-filtration in one compact filter.
Pre CarbonGranular activated carbon: reduces chlorine, taste, and odor ahead of the membrane.
RO MembraneReverse osmosis for dissolved solids reduction.
PCB Polishing Filter1 micron carbon block polishing for taste and odor.
Confirm your system uses 2.5-inch-diameter filters with 1/4-inch push-fit connections and has room for a 12-inch-tall filter. These are not twist-on replacement filters and will not work with twist-on systems. Brand or model name alone does not guarantee compatibility.
Replace the complete set approximately every 12 months. Actual service life varies with water quality and usage. Your order includes a free filter flushing kit; flush each new filter as directed before use. See the RO filter replacement guide for the steps.
NSF-component tested and certified to NSF/ANSI Standard 42. For potable, municipal, cold-water applications only.
Why Raintree™
With 20+ years of water filtration experience, we supply carefully selected, high-quality replacement filters for dependable performance, simpler maintenance and great-tasting water.
Confirm your fit with the details below or in our FAQ, or ask us, and we guarantee it. Unopened sets can be returned within 90 days.
Made with NSF-certified materials for dependable multi-stage filtration and a clean, great-tasting finish.
Responsive, friendly, personalized guidance from our filter experts, before and after you order.
Orders typically ship the same or next business day. Free on orders over $55.
Get your replacement set delivered on your schedule, with no need to remember when it’s time.
Compatibility reference
Expand a brand to view the complete reference list, then confirm the installed filter and connection style and the membrane type before ordering.
Compatible replacements for:
Important: Wellsys systems use both compatible push-fit connections and incompatible proprietary twist-on cartridges. Confirm the installed style.
Configurations vary. Send the model number and clear photos of the installed filters so we can confirm compatibility.
Converting from factory Crystal Quest filters requires No-Tool Fittings. For a combined UF+RO cooler, choose the RO replacement filter set.
View Crystal Quest page →Configurations vary. Send the model number and clear photos of the installed filters so we can confirm compatibility.
Vertex filters often have female ports; No-Tool Fittings may be needed when changing to Raintree™ male-port filters.
All brand names are trademarks of their respective owners. Raintree™ filters are compatible replacements and are not manufactured, endorsed by or affiliated with any of them.
