Carbon block and granular activated carbon (GAC) filter cartridges from AMPAC Water Systems remove chlorine, chloramines, taste, odor, volatile organic compounds (VOCs), and organic contaminants from water. Available in 10-inch and 20-inch lengths in standard 2.5-inch OD and big blue 4.5-inch OD housings. Carbon block cartridges use compressed activated carbon for consistent 5-micron filtration alongside chemical removal. GAC cartridges with KDF media add heavy metal reduction and scale inhibition. Replace every 6-12 months or when taste or odor returns. Compatible with standard RO pre-filter and whole-house filter systems.