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Watts-MAXCL-FF20 C-Max 20" x 4-5/8” Full Flow Chlorine Reduction Carbon Block Filter

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Watts-MAXCL-FF20 C-Max 20" x 4-5/8” Full Flow Chlorine Reduction Carbon Block Filter

Watts-MAXCL-FF20 C-Max 20" x 4-5/8” Full Flow Chlorine Reduction Carbon Block Filter

The Watts MAXCL-FF20 is a thick-walled coconut shell carbon block cartridge engineered for environments where chlorine reduction capacity matters more than anything else. With a 160,000-gallon chlorine reduction rating and 1-micron filtration in a 20" x 4-5/8" form factor, this is the filter you install when you need serious chemical reduction without frequent changeouts.
SPECIFICATIONS

Watts MAXCL-FF20 Technical Details

Model Number MAXCL-FF20
Dimensions 20" length x 4-5/8" diameter
Filtration Rating 1 micron nominal
Chlorine Capacity 160,000 gallons
Media Type Coconut shell carbon block, thick wall construction
Temperature Range 40°F to 165°F
Flow Characteristics Full flow design with low pressure drop
Application Chlorine, taste, odor, and fine sediment reduction
INSTALLATION & USE

Installing the MAXCL-FF20 Carbon Block

  1. Verify your filter housing is designed for 20" x 4-5/8" cartridges and is rated for the system flow rate
  2. Remove the old cartridge, clean the housing sump with a mild bleach solution, and rinse thoroughly before installing the new filter
  3. Insert the Watts MAXCL-FF20 into the housing, ensuring it seats properly on the center post, then hand-tighten the sump
  4. Flush the filter for 5 minutes to remove carbon fines and allow the media to fully saturate before use
COMPATIBILITY

Housing & System Requirements

The MAXCL-FF20 fits standard 20-inch whole house or commercial filter housings with 4-5/8" diameter capacity, including Watts, Pentek, and other brands using the industry-standard Big Blue size. This filter is ideal for municipal water applications with heavy chlorine content, commercial food service equipment protection, or residential point-of-entry systems where extended service life is critical. The full flow design makes it suitable for higher flow rate installations without excessive pressure loss.

🔧 Pro Tip: The 160,000-gallon chlorine capacity assumes municipal chlorine levels around 1-2 ppm. If you're on a well with chlorine injection or have unusually high chlorine levels, track your actual water usage and replace based on taste breakthrough rather than solely relying on the gallon rating.
$87.81

Original: $250.90

-65%
Watts-MAXCL-FF20 C-Max 20" x 4-5/8” Full Flow Chlorine Reduction Carbon Block Filter—

$250.90

$87.81

Product Information

Shipping & Returns

Description

The Watts MAXCL-FF20 is a thick-walled coconut shell carbon block cartridge engineered for environments where chlorine reduction capacity matters more than anything else. With a 160,000-gallon chlorine reduction rating and 1-micron filtration in a 20" x 4-5/8" form factor, this is the filter you install when you need serious chemical reduction without frequent changeouts.
SPECIFICATIONS

Watts MAXCL-FF20 Technical Details

Model Number MAXCL-FF20
Dimensions 20" length x 4-5/8" diameter
Filtration Rating 1 micron nominal
Chlorine Capacity 160,000 gallons
Media Type Coconut shell carbon block, thick wall construction
Temperature Range 40°F to 165°F
Flow Characteristics Full flow design with low pressure drop
Application Chlorine, taste, odor, and fine sediment reduction
INSTALLATION & USE

Installing the MAXCL-FF20 Carbon Block

  1. Verify your filter housing is designed for 20" x 4-5/8" cartridges and is rated for the system flow rate
  2. Remove the old cartridge, clean the housing sump with a mild bleach solution, and rinse thoroughly before installing the new filter
  3. Insert the Watts MAXCL-FF20 into the housing, ensuring it seats properly on the center post, then hand-tighten the sump
  4. Flush the filter for 5 minutes to remove carbon fines and allow the media to fully saturate before use
COMPATIBILITY

Housing & System Requirements

The MAXCL-FF20 fits standard 20-inch whole house or commercial filter housings with 4-5/8" diameter capacity, including Watts, Pentek, and other brands using the industry-standard Big Blue size. This filter is ideal for municipal water applications with heavy chlorine content, commercial food service equipment protection, or residential point-of-entry systems where extended service life is critical. The full flow design makes it suitable for higher flow rate installations without excessive pressure loss.

🔧 Pro Tip: The 160,000-gallon chlorine capacity assumes municipal chlorine levels around 1-2 ppm. If you're on a well with chlorine injection or have unusually high chlorine levels, track your actual water usage and replace based on taste breakthrough rather than solely relying on the gallon rating.
Watts-MAXCL-FF20 C-Max 20" x 4-5/8” Full Flow Chlorine Reduction Carbon Block Filter | Isopure Water