GAC-BB Pentek Replacement Filter Cartridge - Whole House Cartridges - 40.27 - DiscountFilterStore.com

PENTEK-GAC-BB

GAC-BB Pentek Replacement Filter Cartridge

Name: GAC-BB Pentek Replacement Filter Cartridge
Brand: Pentek
SKU: PENTEK-GAC-BB
Price: 40.27 USD
Availability: InStock
Rating: 4.7 (18 reviews)

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$40.27

Price Per Item
Single	$40.27
2 PACK	$39.06
4 PACK	$37.86
6 PACK	$36.65
24 PACK	$35.44

Fits most Big Blue housings that accept 10-inch x 4.5-inch water filter cartridges

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What's this?

Estimated Shipping Date:
Between 06/05/26 and 06/10/26

Thoroughly reduces the harsh effects of chlorine taste and odor
Designed for extended contact between water and carbon for maximum adsorption
Easy to install, with a simple replacement schedule about every three months
Best suited for specific point-of-use applications and NOT for whole house use

Features & Specs

Package Qty: 1

Manufacturer: Pentair Water

Manufacturer's Id: GAC-BB

UPC: 051678153437

Actual Size (in): 9-3/4 inches (Length) x 4-1/2 inches (Outside Diameter)

Primary Filter Media: Granular Activated Carbon

Operating Temperature (°F): 40 - 125

Operating Temperature (°C): 4.4 - 51.7

Brand: Pentek

Advertised Size: 10 x 4-1/2

Length (in): 9.75 in

Outside Diameter (in): 4.5 in

Width (in): 4.5 in

Materials of Construction: End Caps: Polystyrene, Outer Casing: Polystyrene, Expansion Pad: Polypropylene, Gaskets: Buna-N (top) and Santoprene (bottom)

Media Type: Carbon Filter

Post Filter Media: Spun Polypropylene

Thickness (in): 4.5 in

Country of Origin: China

Flow Rate (gpm): 2.0

Includes: One 9.75 x 4.5 Inch Pentek GAC-BB Drinking Water Filter

Instructions

Turn off water supply. Press red pressure-relief button (if present).
Unscrew housing. Remove large o-ring, wipe clean and set aside.
Discard used filter cartridge. Wash housing with dish soap and warm water using a nonabrasive sponge or cloth. Rinse thoroughly.
Fill 1/3 with water. Add about 1 tablespoon of bleach and scrub to disinfect. Rinse thoroughly.
Lubricate o-ring with clean silicone grease. Change o-ring if any damage cuts or degradation are present. Insert o-ring in groove.
NOTE: This step is important to ensure a proper housing seal. Make certain the o-ring is seated level in the groove.
Insert new filter cartridge.
Screw housing onto the cap and hand-tighten. Do not over tighten. Make sure cap standpipe slips into cartridge.
Turn on water supply. Press pressure-relief button (if present). Check for leaks before leaving installation.

Downloads

User Guide

Contaminants Reduced

Bad Taste and Odor

Chlorine Taste & Odor

Odor

Sediment

Filter Life

Filter Life (gallons): 12,500

Filter Life (months): 12 months

Prop65 warning applies to products that contain carbon media. Click here for more details

WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer and birth defects, or other reproductive harm. For more information go to www.p65warnings.ca.gov

Frequently Asked Questions

What is the micron rating of the Pentek GAC-BB filter cartridge?

The Pentek GAC-BB is a Big Blue granular activated carbon cartridge with a nominal 20-micron rating. It uses high-quality coconut shell activated carbon to reduce chlorine taste, odor, and other organic contaminants from your water supply. The 20-micron rating allows for excellent chemical contact time while maintaining strong flow rates, making it ideal for whole-house filtration applications where chlorine removal is the primary concern.

What is the filtration life and capacity of the Pentek GAC-BB cartridge?

The Pentek GAC-BB cartridge has a service life of approximately 6 months or up to 15,000 gallons, whichever comes first, under normal residential use conditions. Its large 4.5" x 9.75" Big Blue format contains a substantial amount of granular activated carbon, providing extended chlorine reduction capacity. Actual filter life may vary depending on your water quality, chlorine levels, and household water consumption. We recommend replacing it every 6 months to maintain optimal performance.

Is the Pentek GAC-BB NSF/ANSI certified, and what does it remove?

The Pentek GAC-BB is tested and certified against NSF/ANSI Standard 42 for the reduction of chlorine taste and odor. The granular activated carbon media effectively reduces free chlorine, bad tastes, odors, and certain volatile organic compounds (VOCs). However, it is not designed to remove sediment, lead, or cysts—for those contaminants, you would need a dedicated sediment pre-filter or a specialty cartridge. The GAC-BB is best used as a chemical reduction stage in a multi-stage whole-house filtration system.

What systems and housings are compatible with the Pentek GAC-BB cartridge?

The Pentek GAC-BB fits all standard 4.5" x 10" Big Blue filter housings, including Pentek Big Blue housings (such as the 150233, 150234, and 20BB series), as well as compatible housings from other manufacturers that accept the 4.5" x 9.75" cartridge size. Its double open-end (DOE) design with standard gaskets ensures a secure, leak-free fit. Always verify your housing dimensions before purchasing to confirm compatibility.

Should I install a sediment pre-filter before the Pentek GAC-BB?

Yes, we strongly recommend installing a sediment pre-filter (such as a 5-micron polypropylene Big Blue cartridge) upstream of the Pentek GAC-BB. Because the GAC-BB uses loose granular activated carbon media optimized for chlorine and chemical reduction, pairing it with a sediment pre-filter prevents dirt, sand, and rust particles from prematurely clogging the carbon bed. This two-stage approach maximizes the service life of your GAC-BB cartridge and delivers cleaner, better-tasting water throughout your home.

GAC-BB Pentek Replacement Filter Cartridge

Frequently Asked Questions

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