---
product_id: 513145787
title: "Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20\" x 4.5\", Pack of 4"
brand: "pentek"
price: "€ 721.26"
currency: EUR
in_stock: true
reviews_count: 4
category: "Pentek"
url: https://www.desertcart.gr/products/513145787-pentair-pentek-gac-20bb-big-blue-carbon-water-filter-20
store_origin: GR
region: Greece
---

# 6-month, 25,000-gallon lifespan 20" Big Blue size for max flow NSF/ANSI 42 certified safety Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5", Pack of 4

**Brand:** pentek
**Price:** € 721.26
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your hydration game with Pentair’s powerhouse carbon filter!

## Quick Answers

- **What is this?** Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5", Pack of 4 by pentek
- **How much does it cost?** € 721.26 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/513145787-pentair-pentek-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

- • **Flow Without the Wait:** Unique radial flow design ensures minimal pressure drop even under high demand.
- • **Long-Lasting Hydration:** Up to 6 months or 25,000 gallons of premium filtration—stress less, live more.
- • **Certified Peace of Mind:** NSF/ANSI Standard 42 certification guarantees trusted water quality performance.
- • **Plug & Play Compatibility:** Fits all 20" Pentair Pentek Big Blue housings for seamless filter upgrades.
- • **Pure Taste, Zero Compromise:** Effectively eliminates chlorine taste & odor for crisp, refreshing water.

## Overview

The Pentair Pentek GAC-20BB is a heavy-duty 20-inch granular activated carbon water filter cartridge designed to reduce chlorine taste and odor while maintaining high water flow with minimal pressure loss. NSF/ANSI 42 certified, it fits all 20" Pentair Pentek Big Blue housings and offers a long service life of up to 6 months or 25,000 gallons, making it an ideal choice for professionals seeking reliable, clean, great-tasting water without compromise.

## Description

Pentair Pentek GAC Series Cartridges effectively reduce unwanted taste and odors, including chlorine taste & odor from your drinking water. Designed to allow maximum contact between the water and carbon ensuring optimal adsorption. The construction of the cartridge allows water to enter at one end and pass through the entire length of the carbon bed before exiting the other end of the cartridge, while an internal expansion pad minimizes channeling or bypass. Before the water exits the cartridge, a post-filter helps reduce carbon fines and other suspended particles from the filtered water. The post-filter is permanently fastened eliminating any potential for bypass. For best results, especially in high flow/high sediment applications, we suggest you team up a GAC post-filter with a Fibredyne pre-filter (Pentair Pentek FloPlus-20BB, EP-20BB, or C1-20BB) or an Extruded Carbon Block pre-filter (Pentair Pentek RFC-20BB or NCP-20BB).

Review: Perfect - The only right Carbon filters Nothing else for me
Review: This is a good water filter - I have used a variety of filters for our water system and they all worked, but I found the Pentek filter lasted a longer period of time so I recomend this filter.

## Features

- ENJOY CLEANER, BETTER TASTING DRINKING WATER with effective unwanted taste & odor reduction, including chlorine taste & odor.
- EXPERIENCE WATER WITHOUT THE WAIT - minimal drop in water pressure AND reduced carbon fines ("specs" commonly associated with GAC styled filters) through the unique radial flow design.
- TESTED AND CERTIFIED BY NSF INTERNATIONAL to NSF/ANSI Standard 42 for your peace of mind.
- DESIGNED FOR 20" PENTAIR PENTEK BIG BLUE FILTER HOUSINGS and can replace any 20" x 4.5" carbon filter. For best results, especially in high flow/high sediment applications, we suggest you team up a GAC post-filter with a Fibredyne pre-filter (Pentair Pentek FloPlus-20BB, EP-20BB, or C1-20BB). Extruded Carbon Block is another great pre-filter choice (Pentair Pentek RFC-20BB or NCP-20BB filter).
- LONG FILTER LIFE OF 6 MONTHS – 25,000-gallon capacity translates to replacing the filter every 6 months (or when you notice a drop in water pressure/quality). You can also stress less and live more when you purchase a convenient case pack! Your future self will thank you.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BMFGX9JR |
| Brand | Pentek |
| Brand Name | Pentek |
| Customer Reviews | 4.5 out of 5 stars 32 Reviews |
| External Testing Certification | NSF |
| External testing certification | NSF |
| Global Trade Identification Number | 30051678249438 |
| Item Dimensions D x W x H | 11.4D x 11.4W x 50.8H centimeters |
| Item Weight | 20 Pounds |
| 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 benefits | Reduces Chlorine |
| Product dimensions | 11.4D x 11.4W x 50.8H centimeters |
| 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:** 11.4D x 11.4W x 50.8H centimeters

## Images

![Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5", Pack of 4 - Image 1](https://m.media-amazon.com/images/I/71OBYDaBmAL.jpg)
![Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5", Pack of 4 - Image 2](https://m.media-amazon.com/images/I/81Nl6X4thyL.jpg)
![Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5", Pack of 4 - Image 3](https://m.media-amazon.com/images/I/81HxErBaqGL.jpg)
![Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5", Pack of 4 - Image 4](https://m.media-amazon.com/images/I/61aHZKgvv3L.jpg)
![Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5", 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

### ⭐⭐⭐⭐⭐ Perfect
*by J***L on 20 March 2025*

The only right Carbon filters Nothing else for me

### ⭐⭐⭐⭐⭐ This is a good water filter
*by J***K on 17 October 2024*

I have used a variety of filters for our water system and they all worked, but I found the Pentek filter lasted a longer period of time so I recomend this filter.

### ⭐⭐⭐⭐⭐ Reliable
*by A***T on 1 August 2024*

We have used these for years in our whole-house filtering system. Occasionally we have tried generic filters because of price, but we always come back to these. Our city dumps a huge amount of chlorine in our water and these get rid of all of the smell and taste.

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-08-24*