Carbon block filtration is adsorption, not straining. Contaminants bond to the carbon surface as water passes through, so both micron rating and carbon density determine how long a cartridge lasts and how well it performs. Puregen and Puroflo build the carbon block cartridges AMPAC stocks for chlorine, taste, and odor reduction, in 10″, 20″, Big Blue, and slimline formats. Placed ahead of an RO membrane, the same cartridge doubles as chlorine protection: polyamide membranes degrade fast without it. See current options under AMPAC’s carbon block filters.