---
product_id: 510577798
title: "Pentair Pentek GAC-20BB Big Blue Granular Activated Carbon Water Filter, 20\" x 4.5\", Chlorine Taste Odor Reduction, NSF Certified, Pack of 4"
brand: "pentek"
price: "₨13914"
currency: SCR
in_stock: true
reviews_count: 13
category: "Pentek"
url: https://www.desertcart.sc/products/510577798-pentair-pentek-gac-20bb-big-blue-granular-activated-carbon-water
store_origin: SC
region: Seychelles
---

# 25,000 gal chlorine reduction 20" x 4.5" Big Blue drop-in fit NSF/ANSI Standard 42 certified Pentair Pentek GAC-20BB Big Blue Granular Activated Carbon Water Filter, 20" x 4.5", Chlorine Taste Odor Reduction, NSF Certified, Pack of 4

**Brand:** pentek
**Price:** ₨13914
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your water game with Pentair’s powerhouse filtration—because your home deserves the best sip.

## Quick Answers

- **What is this?** Pentair Pentek GAC-20BB Big Blue Granular Activated Carbon Water Filter, 20" x 4.5", Chlorine Taste Odor Reduction, NSF Certified, Pack of 4 by pentek
- **How much does it cost?** ₨13914 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/510577798-pentair-pentek-gac-20bb-big-blue-granular-activated-carbon-water)

## Best For

- pentek enthusiasts

## Why This Product

- Trusted pentek brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Long-Lasting Freshness:** Each cartridge filters up to 25,000 gallons at 4 gpm, minimizing reorder frequency and downtime.
- • **Pure Hydration, Zero Compromise:** Granular activated carbon slashes chlorine, taste, and odor for crisp, clean water.
- • **Certified Safety, Trusted Quality:** NSF/ANSI Standard 42 certification guarantees premium material safety and filtration reliability.
- • **Built to Last, Engineered to Perform:** Internal polypropylene pad prevents channeling, ensuring every drop is filtered evenly.
- • **Seamless Integration, Instant Upgrade:** Direct drop-in replacement for Pentair Pentek Big Blue housings—no hassle, just pure water.

## Overview

The Pentair Pentek GAC-20BB is a 20" granular activated carbon water filter cartridge designed for Big Blue housings. Certified by NSF/ANSI Standard 42, it effectively reduces chlorine, taste, and odor, delivering up to 25,000 gallons of cleaner water at a steady 4 gpm flow rate. Featuring an internal polypropylene expansion pad and spun polypropylene post-filter, it ensures even filtration and traps carbon fines, providing reliable, long-lasting performance in a convenient 4-pack.

## Description

The Pentair Pentek GAC-20BB delivers reliable granular activated carbon filtration for whole-house and commercial systems equipped with Big Blue 20-inch housings. Each cartridge reduces chlorine, taste, and odor using a proven GAC media bed, providing cleaner water at a steady flow rate with only 10 psi of pressure drop at 4 gpm.Engineered for consistent performance, the GAC-20BB features an internal polypropylene expansion pad that minimizes channeling and bypass, ensuring water passes evenly through the carbon bed. A spun polypropylene post-filter captures carbon fines before they reach your tap. Polystyrene end caps and outer casing provide structural integrity, while Buna-N and Santoprene gaskets ensure a secure, leak-free seal.Each cartridge is NSF/ANSI Standard 42 certified for material requirements and delivers up to 25,000 gallons of chlorine reduction capacity at 4 gpm. This 4-pack provides extended coverage for households and facilities that depend on dependable water filtration year-round.

Review: Water softener house filter. - This is an excellent replacement house filter for my water softener system. Excellent OEM filter with a friendly budget. Installed and works excellent, exact match and no issues with the installation. Highly recommend this house filter to make your water safer to use and preserve your internal pluming system and apppliances.
Review: excellent water filters! - work well, easy to install!

## Features

- CLEANER, BETTER-TASTING WATER - Granular activated carbon effectively reduces chlorine, unwanted taste, and odor for improved water quality throughout your home or facility
- MINIMIZED CHANNELING AND CARBON FINES - Internal polypropylene expansion pad prevents water from bypassing the carbon bed, while a spun polypropylene post-filter traps loose fines
- NSF/ANSI STANDARD 42 CERTIFIED - Tested and certified by NSF International for material requirements, giving you confidence in the safety and quality of every cartridge
- FITS 20" PENTAIR PENTEK BIG BLUE HOUSINGS - Designed as a direct drop-in replacement cartridge (4.50" x 20") for Big Blue filter systems; operates at 40-125 degrees F
- 25,000-GALLON CHLORINE REDUCTION CAPACITY - Extended filter life at 4 gpm flow rate; this convenient 4-pack keeps your system running with fewer reorder interruptions

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BMFGX9JR |
| Best Sellers Rank | #8,481 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #58 in Replacement Under-Sink Water Filters |
| Brand | Pentek |
| Brand Name | Pentek |
| Customer Reviews | 4.6 out of 5 stars 1,324 Reviews |
| External Testing Certification | NSF |
| Global Trade Identification Number | 30051678249438 |
| Item Dimensions D x W x H | 4.5"D x 4.5"W x 20"H |
| Item Type Name | GAC Carbon Water Filter |
| Item Weight | 20 pounds |
| Manufacturer | Pentair |
| Manufacturer Part Number | 155249-43 |
| Material | Activated Carbon,Carbon |
| Material Type | Activated Carbon,Carbon |
| Model Number | GAC-20BB |
| Number of Items | 4 |
| Product Benefits | Reduces Chlorine |
| Product Dimensions | 4.5"D x 4.5"W x 20"H |
| Set Name | 4 |
| Unit Count | 4 Count |

## Product Details

- **External Testing Certification:** NSF
- **Item Weight:** 20 pounds
- **Material:** Activated Carbon,Carbon
- **Product Benefits:** Reduces Chlorine
- **Product Dimensions:** 4.5"D x 4.5"W x 20"H

## Images

![Pentair Pentek GAC-20BB Big Blue Granular Activated Carbon Water Filter, 20" x 4.5", Chlorine Taste Odor Reduction, NSF Certified, Pack of 4 - Image 1](https://m.media-amazon.com/images/I/71OBYDaBmAL.jpg)
![Pentair Pentek GAC-20BB Big Blue Granular Activated Carbon Water Filter, 20" x 4.5", Chlorine Taste Odor Reduction, NSF Certified, Pack of 4 - Image 2](https://m.media-amazon.com/images/I/81Nl6X4thyL.jpg)
![Pentair Pentek GAC-20BB Big Blue Granular Activated Carbon Water Filter, 20" x 4.5", Chlorine Taste Odor Reduction, NSF Certified, Pack of 4 - Image 3](https://m.media-amazon.com/images/I/81HxErBaqGL.jpg)
![Pentair Pentek GAC-20BB Big Blue Granular Activated Carbon Water Filter, 20" x 4.5", Chlorine Taste Odor Reduction, NSF Certified, Pack of 4 - Image 4](https://m.media-amazon.com/images/I/61aHZKgvv3L.jpg)
![Pentair Pentek GAC-20BB Big Blue Granular Activated Carbon Water Filter, 20" x 4.5", Chlorine Taste Odor Reduction, NSF Certified, Pack of 4 - Image 5](https://m.media-amazon.com/images/I/71ZZBSPbwML.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Water softener house filter.
*by A***R on September 22, 2026*

This is an excellent replacement house filter for my water softener system. Excellent OEM filter with a friendly budget. Installed and works excellent, exact match and no issues with the installation. Highly recommend this house filter to make your water safer to use and preserve your internal pluming system and apppliances.

### ⭐⭐⭐⭐⭐ excellent water filters!
*by J***G on August 23, 2026*

work well, easy to install!

### ⭐⭐⭐⭐⭐ We have pressure again!
*by A***S on August 27, 2026*

Diagnosed poor water flow down to big blue here. We hadn't changed it out as directed and needed these badly. Water pressure was really, really bad. Now its like a spa. Magic. Pro tip: Try replacing these when your water pressure tanks!

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*Product available on Desertcart Seychelles*
*Store origin: SC*
*Last updated: 2026-10-07*