---
product_id: 253578715
title: "Pentek Pentair GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20\" x 4.5\""
brand: "pentek"
price: "€ 181.27"
currency: EUR
in_stock: true
url: https://www.desertcart.pt/products/253578715-pentek-pentair-gac-20bb-big-blue-carbon-water-filter-20
store_origin: PT
region: Portugal
---

# NSF Certified 25,000 Gallon Capacity Fits 20" Housings Pentek Pentair GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5"

**Brand:** pentek
**Price:** € 181.27
**Availability:** ✅ In Stock

## Summary

> 💦 Elevate Your Hydration Game!

## Quick Answers

- **What is this?** Pentek Pentair GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5" by pentek
- **How much does it cost?** € 181.27 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/253578715-pentek-pentair-gac-20bb-big-blue-carbon-water-filter-20)

## 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

- • **Peace of Mind:** NSF certified for your safety and confidence.
- • **Enhanced Filtration:** Post-filter reduces carbon fines and particles.
- • **Transform Your Water:** Say goodbye to bad taste and odors!
- • **Universal Compatibility:** Fits all 20" Pentair Big Blue systems.
- • **Long-Lasting Performance:** Enjoy up to 25,000 gallons of purified water.

## Overview

The PentekPentair GAC-20BB Big Blue Carbon Water Filter is a heavy-duty granular activated carbon replacement cartridge designed for whole house filtration. Measuring 20" x 4.5", it effectively reduces bad taste and odors, ensuring high-quality drinking water. With a capacity of 25,000 gallons, this filter fits all compatible 20" housings and is NSF certified for safety.

## Description

Pentek Pentair GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5"

## Features

- EFFECTIVE REDUCTION OF BAD TASTE & ODORS to provide good general-purpose drinking water
- FITS ALL 20" Pentair Pentek Big Blue or other 20" heavy duty housings and can replace any 20" x 4.5" carbon filter cartridge
- POST-FILTER HELPS REDUCE CARBON FINES and other suspended particles from the filtered water
- NSF INTERNATIONAL tested and certified for your peace of mind
- 25,000 GALLON CAPACITY. Replace every six months or when you notice a drop in water pressure or water quality

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Pentek |
| Model Number | 155249-43 |
| Color | Blue |
| Diameter | 4.5 Inches |
| Capacity | 25000 Gallons |
| Material | Pleated Carbon-Impregnated |
| Compatible Models | 155249-43, GAC20-BB, GAC-20BB |
| Item Weight | 2.27 Kilograms |

## Product Details

- **Material:** Pleated Carbon-Impregnated
- **Product dimensions:** 11.6D x 49.7W x 11.6H centimeters
- **Item weight:** 2.27 kg
- **External testing certification:** NSF, ANSI
- **Product benefits:** Reduces bad taste and odors, removes fine carbon particles and other suspended particles, NSF certified

## Images

![Pentek Pentair GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5" - Image 1](https://m.media-amazon.com/images/I/61mBU1KXdXL.jpg)

## Available Options

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

## Questions & Answers

**Q: How come 1 is 50 dollars and a 2 pack is 200 dollars ?**
A: I haven't purchased this item lately, the $200 2 pack may be a for 2 2 packs.

**Q: Will it fit a culligan installed filter housing - a bb gac 20 ??**
A: The one I received was for a cullingan big blue filter collapsed blocking flow  and putting a lot of charcoal granules through out system. I have used these filters for years with little problem ,it may have been a fluke

**Q: What does bb mean? is it different from the gac-20?**
A: BB means that it is designed to fit our Big Blue housings which hold a 4 inch diameter cartridge rather than the standard 2.4 or 2.5 inch diameter cartridges. If you have additional questions, please reach out to our technical support team (USA based) at 800-279-9404.

**Q: How do you know when to change this filter?**
A: Vincent, If this is a residential application this filter should be replaced approx. every 6 months - 1 year. Never past 1 year. If you smell or taste chlorine or have an odor in your water the filter should be replaced. Let us know if this helps. Thanks, Paul.

## Frequently Bought Together

- Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5"
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- Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack)

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-02-03*