The Watts WCBFF20 is a 20"x4.5" coconut shell carbon block filter engineered to deliver over 20,000 gallons of chlorine reduction at whole-house flow rates up to 7 GPM. This 5-micron rated cartridge fits standard Big Blue housings and combines sediment filtration with advanced taste and odor removal for point-of-entry or high-demand applications.
SPECIFICATIONS
Core Performance Data
Dimensions
20" x 4.5"
Big Blue standard
Micron Rating
5 Micron
Nominal filtration
Flow Rate
7 GPM
Nominal capacity
Chlorine Capacity
20,000 gal
@ 4 GPM testing
Media Type
Coconut Shell
Carbon block
Wall Type
Standard
Industry fit
TECHNICAL DETAILS
Filter Specifications
| Model Number | WCBFF20 |
| Manufacturer | Watts |
| Filter Type | Carbon Block (Coconut Shell) |
| Outer Diameter | 4.5 inches |
| Length | 20 inches |
| Micron Rating | 5 micron (nominal) |
| Chlorine Reduction | > 20,000 gallons @ 4 GPM |
COMPATIBILITY & APPLICATIONS
Housing Fit and Use Cases
This Watts WCBFF20 cartridge is designed for all standard 20-inch Big Blue filter housings with 4.5-inch inner diameter openings. Ideal for whole-house filtration, point-of-entry systems, well water applications, and high-demand commercial installations where chlorine taste and odor removal is required alongside sediment reduction. The coconut shell carbon block construction offers superior adsorption capacity compared to standard GAC filters while maintaining the flow rates needed for residential and light commercial use. Replace every 6-12 months depending on water quality and household demand.
💧 Coconut shell carbon outperforms coal-based alternatives in both chlorine capacity and organic contaminant adsorption—this is the material professional installers choose for whole-house applications where performance and longevity matter.
