--- product_id: 3678874 title: "- Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20\" x 4.5\"" brand: "pentek" price: "AR$367947" currency: ARS in_stock: true reviews_count: 13 category: "Pentek" url: https://www.desertcart.com.ar/products/3678874-pentair-pentek-gac-20bb-big-blue-carbon-water-filter-20 store_origin: AR region: Argentina --- # 25,000 gallon capacity Heavy duty granular activated carbon Fits all 20" Big Blue housings - Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5" **Brand:** pentek **Price:** AR$367947 **Availability:** βœ… In Stock ## Summary > πŸ’§ Elevate your hydration game with the ultimate Big Blue 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" by pentek - **How much does it cost?** AR$367947 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/3678874-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 - β€’ **Advanced Carbon Tech:** Granular activated carbon maximizes contaminant adsorption for superior water quality. - β€’ **Universal Big Blue Fit:** Seamlessly replaces any 20" x 4.5" carbon filter cartridgeβ€”no hassle, just pure refreshment. - β€’ **Certified Peace of Mind:** NSF/ANSI tested and certified to ensure safety and reliability every sip. - β€’ **Long-Lasting Performance:** Up to 25,000 gallons or 6 months of premium filtration before replacement. - β€’ **Pure Taste, Zero Compromise:** Effectively reduces chlorine taste & odors for crisp, clean water. ## Overview The Pentair Pentek GAC-20BB is a 20-inch heavy-duty granular activated carbon water filter cartridge designed to fit all standard 20" Big Blue housings. It delivers up to 25,000 gallons of superior filtration by effectively reducing chlorine taste, odors, and other contaminants. Featuring a post-filter to minimize carbon fines, this NSF-certified cartridge ensures clean, great-tasting water for up to six months, making it the trusted choice for professional-grade home water filtration. ## 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 - 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 | #8,438 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #72 in Replacement Under-Sink Water Filters | | Brand Name | Pentek | | Customer Reviews | 4.6 4.6 out of 5 stars (1,283) | | External Testing Certification | NSF, ANSI | | Global Trade Identification Number | 00051678249437 | | Included Components | filter | | Item Dimensions D x W x H | 4.57"D x 19.58"W x 4.57"H | | 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 | Pleated Carbon-Impregnated | | Model Number | GAC-20BB | | Number of Items | 1 | | Product Benefits | Reduces Chlorine | | 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:** Pleated Carbon-Impregnated - **Product Benefits:** Reduces Chlorine - **Product Dimensions:** 4.57"D x 19.58"W x 4.57"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" - 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. ## 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 ... ## 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.com.ar/products/3678874-pentair-pentek-gac-20bb-big-blue-carbon-water-filter-20](https://www.desertcart.com.ar/products/3678874-pentair-pentek-gac-20bb-big-blue-carbon-water-filter-20) --- *Product available on Desertcart Argentina* *Store origin: AR* *Last updated: 2026-05-22*