--- product_id: 253578715 title: "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: "€ 223.87" currency: EUR in_stock: true category: "Pentek" url: https://www.desertcart.gr/products/253578715-pentair-gac-20bb-big-blue-carbon-water-filter-20-inch store_origin: GR region: Greece --- # NSF certified for safety 25,000 gallon capacity Fits all 20" Big Blue housings 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:** € 223.87 **Availability:** βœ… In Stock ## Summary > πŸ’§ Elevate your home hydration game with the Big Blue powerhouse! ## Quick Answers - **What is this?** 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?** € 223.87 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/253578715-pentair-gac-20bb-big-blue-carbon-water-filter-20-inch) ## 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 - β€’ **Advanced Carbon Tech:** Granular Activated Carbon maximizes contaminant adsorption for superior water quality. - β€’ **Post-Filter Perfection:** Built-in post-filter reduces carbon fines and suspended particles, ensuring crystal-clear water. - β€’ **Long-Lasting Performance:** Filters up to 25,000 gallonsβ€”replace only every six months for hassle-free freshness. - β€’ **Pure Taste, Zero Compromise:** Effectively eliminates chlorine taste & odors for crisp, clean water. - β€’ **Universal Fit, Ultimate Convenience:** Compatible with all 20" Pentair Big Blue and similar heavy-duty housings. ## Overview The Pentek Pentair GAC-20BB is a 20-inch heavy-duty granular activated carbon water filter cartridge designed for whole-house filtration. Certified by NSF, it fits all standard 20" Big Blue housings and delivers up to 25,000 gallons of clean, odor-free water by effectively reducing chlorine taste, odors, and suspended particles. Its innovative design includes a post-filter to minimize carbon fines, ensuring consistently pure water for up to six months. ## Description Pentair Pentek GAC Series Cartridges effectively reduce unwanted tastes and odors, including chlorine taste & odor from your drinking water. They are 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 to an innovative support basket ensuring that it is firmly se d and eliminating any potential for bypass. GAC Series Cartridges are available in a variety of sizes and flow rates, and effectively provide good general-purpose drinking water filtration. ## 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 | |---------------|-------| | ASIN | B0014C067K | | Best Sellers Rank | #57,453 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #192 in Replacement Water Filters | | Brand Name | Pentek | | Customer Reviews | 4.6 4.6 out of 5 stars (1,153) | | External Testing Certification | NSF, ANSI | | Global Trade Identification Number | 00051678249437 | | Included Components | filter | | Item Dimensions D x W x H | 11.6D x 49.7W x 11.6H centimeters | | Item Type Name | 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" | | Item Weight | 5 Pounds | | Manufacturer | Pentair Industries | | Manufacturer Part Number | 155249-43 | | Material Type | Activated Carbon | | Model Number | GAC-20BB | | Number of Items | 1 | | Product Benefits | Reduces bad taste and odors, removes fine carbon particles and other suspended particles, NSF certified | | Set Name | Pentek GAC-20BB Set | | UPC | 851905124281 051678249437 | | Unit Count | 1 Count | ## Product Details - **External testing certification:** NSF, ANSI - **Item weight:** 5 Pounds - **Material:** Activated Carbon - **Product dimensions:** 11.6D x 49.7W x 11.6H centimeters ## Images ![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" - Pentair Pentek DGD-5005-20 Big Blue Water Filter, 20-Inch Whole House Sediment Filter Cartridge Replacement, Dual-Gradient Density Spun Polypropylene, 20" x 4.5", 5 Micron, Pack of 1, White - Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack) --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.gr/products/253578715-pentair-gac-20bb-big-blue-carbon-water-filter-20-inch](https://www.desertcart.gr/products/253578715-pentair-gac-20bb-big-blue-carbon-water-filter-20-inch) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-10-20*