Individual Replacement Filter
1 micron carbon block polishing for taste and odor.
Optional add-ons
Faster filter changes—without tools or broken fingernails.
Automatically shuts off the water supply when its detection pad gets wet.
What it does
Combines activated carbon adsorption with 1 micron physical filtration.
Helps reduce residual chlorine and unwanted taste and odor.
Provides a consistent carbon polishing stage.
PCB configuration
The Post Carbon Block is a finishing stage. It follows the UF or RO membrane, or pre-filtration in a system without a membrane.
This filter
The Raintree™ Post Carbon Block Filter combines the adsorption capability of activated carbon with the physical filtration of a solid carbon block. Its 1 micron structure provides an additional barrier for fine particulate matter while helping reduce residual chlorine, unwanted taste and odor, and discoloration.
| Filter format | 12 inches tall × 2.5 inches in diameter, I-type |
|---|---|
| Connections | 1/4 inch |
| Ports | 2 (1 inlet, 1 outlet) |
| Filter media | Activated carbon and polypropylene (carbon block) |
| Pore size | 1 micron |
| Maximum water flow rate | 1.1 GPM (4 LPM) |
| Rated filtration volume | 6,000 L / approximately 1,585 gallons |
| Maximum pressure | 114 PSI |
| Failure pressure | 280 PSI |
| Maximum temperature | 100°F (38°C) |
| Housing / origin | Polypropylene / Made in Korea |
Confirm the 12 × 2.5 inch I-type format, 1/4-inch connection style, available space, filter position and flow direction.
Replace at the rated volume, when flow or water quality declines, or at least annually if the rated volume is not reached.
Install after the UF or RO membrane as a polishing filter. In a non-membrane system, install after sediment and carbon pre-filtration. If an Alkaline Mineral or PFAS Reduction Filter is included, install the Post Carbon Block Filter before it.
NSF component tested and certified to NSF/ANSI Standard 42. For potable, municipal, cold-water applications only. Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system.
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 shipping on orders over $55.
Get your replacement filter 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.
