The Watts WCB20FF-CHLORA is a 20"x4.5" catalytic carbon block filter engineered specifically for chloramine reduction in whole-house applications. With 4x the chloramine capacity of standard carbon blocks and 2x the chlorine capacity, this coconut shell filter delivers up to 24,000 gallons of chloramine reduction at 2 GPM.
SPECIFICATIONS
Watts WCB20FF-CHLORA Technical Details
| Dimensions | 20" x 4.5" (Big Blue) |
| Micron Rating | 1 Micron Nominal |
| Flow Rate | 7 GPM Maximum |
| Chlorine Capacity | 200,000+ gallons @ 4 GPM |
| Chloramine Capacity | 24,000 gal @ 2 GPM / 12,000 gal @ 4 GPM |
| Media Type | Coconut Shell Catalytic Carbon Block |
| Filter Type | Standard Wall |
| Applications | Whole-house POE, Commercial POU |
INSTALLATION & USE
Installing Your Catalytic Carbon Filter
- Turn off water supply and relieve pressure from your 20" Big Blue housing by opening a downstream faucet
- Remove housing sump using a filter wrench, discard old filter, and clean the sump with mild soap and water
- Insert the Watts WCB20FF-CHLORA filter into the housing, ensuring it seats properly on the center post
- Lubricate the o-ring with silicone grease, hand-tighten the sump, and slowly turn water back on to check for leaks
- Flush filter for 5 minutes at low flow to remove any carbon fines before normal use
COMPATIBILITY
Housing Requirements
The WCB20FF-CHLORA fits all standard 20" x 4.5" Big Blue filter housings, including Watts, Pentek, Hydronix, and other industry-standard brands. This filter is designed for whole-house point-of-entry systems where chloramine removal is required, particularly in municipal water systems that have switched from chlorine to chloramine disinfection. The 1 micron nominal filtration also provides sediment and particulate reduction alongside chemical contaminant removal.
🔧 Pro Tip: Chloramine reduction rates drop significantly at higher flow rates. If you have high household demand, consider installing two filters in parallel to maintain 2 GPM per filter and maximize your 24,000 gallon capacity per cartridge.
