---
product_id: 510577798
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: "KD 151.80"
currency: KWD
in_stock: true
reviews_count: 13
category: "Pentek"
url: https://www.desertcart.com.kw/products/510577798-pentair-pentek-gac-20bb-big-blue-carbon-water-filter-20
store_origin: KW
region: Kuwait
---

# 6-month, 25,000-gallon lifespan 20-inch heavy-duty size NSF/ANSI 42 certified - 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:** KD 151.80
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your hydration game with Pentair’s Big Blue carbon power!

## 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?** KD 151.80 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/510577798-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

- • **Big Blue Power:** Fits all 20" Pentair Pentek Big Blue housings for easy, reliable replacement.
- • **Flow Without the Wait:** Unique radial flow design ensures minimal pressure drop and no annoying carbon fines.
- • **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.
- • **Pure Taste, Zero Compromise:** Effectively eliminates chlorine taste & odor for crisp, refreshing water.

## Overview

The Pentair Pentek GAC-20BB is a 20-inch heavy-duty granular activated carbon water filter cartridge designed to reduce chlorine taste and odor while maintaining strong water flow. Certified to NSF/ANSI Standard 42, it fits all Pentair Pentek Big Blue housings and offers up to 6 months or 25,000 gallons of reliable filtration. Its radial flow design minimizes pressure drop and carbon fines, ensuring cleaner, better-tasting water for your home or office.

## 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 fit - perfect repacement, good price for this filter, it was 2x the price at dealer, no issues.
Review: What a difference - I had a DIY dual filter setup with Pentek 158643 3/8" #10 3G Slim Line Clear Filter Housings for my cold sink water. A while back I downgraded to the cheap generic filters, and noticed a huge downgrade in taste. It was not drinkable water. So to fix it, I added a third Pentek filter housing, and went back to what worked- genuine Pentek filters. The sediment filter I had didn't seem to fit properly, I don't think it sealed at all, so I ditched that completely and used a cheap but working DuPont WFPFC8002 Universal Whole House Carbon Wrap 2-Phase Cartridge as a sediment filter. Second in line I swapped the $6.50 DuPont with the $9.63 Pentek CBC-10 Carbon Block Filter Cartridge, 9-3/4" x 2-7/8", 0.5 Micron, a solid secondary filter w/ a perfect fit. The Pentek feels like it weighs 3x as much as the Dupont, no question it's worth the few extra dollars. The third and final filter was the hardest decision. I have tried both the Pentek ChlorPlus 10 Carbon Block Filter Cartridge, 10" x 2-1/2", 1 Micron, and the Pentek CC-10 Coconut Carbon Drinking Water Filters (9.75" x 2.875"), both of which were fantastic, make a noticeable difference to the taste of the water, and costs about $15-20. Instead, I went with a $12 option, the Pentek GAC-10 Drinking Water Filter (9-3/4" x 2-7/8"), hoping it would deliver similar results, especially considering the town water is fairly clean to begin with, ppm around 48. Would probably go with the CC-10 next time, but I'm very happy with the current results. The Pentek filter and housing combo really restored my drinking water back to amazing. Neighbors knock at my door with 5 gallon jugs because they can taste the difference too.

## 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 |
| Batteries Required? | No |
| Best Sellers Rank | #8,169 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #63 in Replacement Under-Sink Water Filters |
| Brand | Pentek |
| Color | Blue |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,268) |
| Date First Available | April 21, 2023 |
| External Testing Certification | NSF |
| Global Trade Identification Number | 30051678249438 |
| Item Package Quantity | 1 |
| Item Weight | 20 pounds |
| Item model number | GAC-20BB |
| Manufacturer | Pentair |
| Material | Activated Carbon,Carbon |
| Number of Items | 4 |
| Part Number | 155249-43 |
| Pattern | Filter |
| Product Benefits | Reduces Chlorine |
| Product Dimensions | 4.5"D x 4.5"W x 20"H |
| Set Name | 4 |
| Size | Pack of 4 |
| Style | 20" x 4.5" |
| Unit Count | 4.0 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 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)

## Customer Reviews

### ⭐⭐⭐⭐⭐ perfect fit
*by K***E on November 6, 2025*

perfect repacement, good price for this filter, it was 2x the price at dealer, no issues.

### ⭐⭐⭐⭐⭐ What a difference
*by P***E on March 24, 2019*

I had a DIY dual filter setup with Pentek 158643 3/8" #10 3G Slim Line Clear Filter Housings for my cold sink water. A while back I downgraded to the cheap generic filters, and noticed a huge downgrade in taste. It was not drinkable water. So to fix it, I added a third Pentek filter housing, and went back to what worked- genuine Pentek filters. The sediment filter I had didn't seem to fit properly, I don't think it sealed at all, so I ditched that completely and used a cheap but working DuPont WFPFC8002 Universal Whole House Carbon Wrap 2-Phase Cartridge as a sediment filter. Second in line I swapped the $6.50 DuPont with the $9.63 Pentek CBC-10 Carbon Block Filter Cartridge, 9-3/4" x 2-7/8", 0.5 Micron, a solid secondary filter w/ a perfect fit. The Pentek feels like it weighs 3x as much as the Dupont, no question it's worth the few extra dollars. The third and final filter was the hardest decision. I have tried both the Pentek ChlorPlus 10 Carbon Block Filter Cartridge, 10" x 2-1/2", 1 Micron, and the Pentek CC-10 Coconut Carbon Drinking Water Filters (9.75" x 2.875"), both of which were fantastic, make a noticeable difference to the taste of the water, and costs about $15-20. Instead, I went with a $12 option, the Pentek GAC-10 Drinking Water Filter (9-3/4" x 2-7/8"), hoping it would deliver similar results, especially considering the town water is fairly clean to begin with, ppm around 48. Would probably go with the CC-10 next time, but I'm very happy with the current results. The Pentek filter and housing combo really restored my drinking water back to amazing. Neighbors knock at my door with 5 gallon jugs because they can taste the difference too.

### ⭐⭐⭐⭐⭐ Awesome filter !
*by A***O on August 17, 2025*

There is a reason why they cost a bit more than most. They have a lot of granular carbon. You get what you pay for.. I have yet to install them in my 5 stage watts RO system. which has been resulting in 4ppm. for one year prior to changing all filters... The RO dow tech membrane i only replace every 5 years... my pre sediment is 1 micron ...

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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-02-11*