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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

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.
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

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