3 Big Blue (GAC) Granular Activated Carbon Water Filters 4.5" x 10" Cartridges 3 Big Blue Granular Activated Carbon Filters for a Standard Size 10 inch Big Blue Housings. Standard size filters 4.5x 10 These can used for residential and commercial applications. All our filters individually wrapped for freshness and protection while in shipment. Effectively eliminates many impurities from tap water to offer sparkling clean and great tasting water throughout your whole house.