Pentek GAC-20 – 20" Granular Activated Carbon Filter Cartridge for Chlorine, Taste & Odor Reduction

The Pentek GAC‑20 is a 20″ granular activated carbon (GAC) filter cartridge designed to reduce chlorine taste and odor while enhancing water clarity. Ideal for point-of-entry or whole-house systems using standard 20″ × 2.5″ filter housings.

Filter Type: Granular activated carbon (GAC) with radial-flow post-filter

Nominal Rating: 20 microns (post-filter to reduce carbon fines)

Dimensions: 20″ length × ~2.88″ outer diameter

Chlorine Reduction Capacity: Approximately 10,000 gallons at 2 GPM

Pressure Drop: ~16 psi at 2 GPM

Operating Temperature: 40°F to 125°F (4.4°C to 51.7°C)

Filter Life: Up to ~6 months or ~10,000 gallons (depending on usage)

Construction: Granular carbon media inside polystyrene shell; includes 20‑micron spun polypropylene post-filter and Buna‑N/Santoprene gaskets

Certifications: NSF/ANSI Standard 42 (materials & structural integrity only)

Model Number: 155111‑43

Fits Housings: Standard 20″ × 2.5″ slimline filter housings (not compatible with Big Blue housings)