![Amazon.com: 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" : Everything Else Amazon.com: 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" : Everything Else](https://m.media-amazon.com/images/I/61APOSkYqqS.jpg)
Amazon.com: 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" : Everything Else
![Amazon.com: Express Water – 1 Pack Granular Activated Carbon GAC Water Filter Replacement – 5 Micron – 10 inch – Under Sink and Reverse Osmosis System : Everything Else Amazon.com: Express Water – 1 Pack Granular Activated Carbon GAC Water Filter Replacement – 5 Micron – 10 inch – Under Sink and Reverse Osmosis System : Everything Else](https://m.media-amazon.com/images/I/61xSTVHHLvL.jpg)
Amazon.com: Express Water – 1 Pack Granular Activated Carbon GAC Water Filter Replacement – 5 Micron – 10 inch – Under Sink and Reverse Osmosis System : Everything Else
![Amazon.com: SpiroPure SP-GAC-10 10x2.5 20 Micron Coconut Shell Granular Activated Carbon (GAC) Water Filter Cartridge GAC-10 155109-43 (Case of 12) : Tools & Home Improvement Amazon.com: SpiroPure SP-GAC-10 10x2.5 20 Micron Coconut Shell Granular Activated Carbon (GAC) Water Filter Cartridge GAC-10 155109-43 (Case of 12) : Tools & Home Improvement](https://m.media-amazon.com/images/I/81WXFRmGnOL._AC_UF894,1000_QL80_.jpg)