Check the listing for details. Pentek GAC-BB 20 Micron Big Blue 10 Inch Carbon Water Filter4.5'' x 10''. Color: Blue, Condition: New, Made in China. Listed at 49.99 USD. Pentek 155153-43 GAC-BB Coconut Granular Activated Carbon Cartridge features:Coconut Granular Activated Carbon CartridgeDimensions: 9-3/4″ x 4 1/2″ known as 4.5" By 10" 3-6 monthsEffective bad taste & odor and chlorine taste & odor reductionThe Pentek GAC-10 (155153-43) is a coconut-based granular activated carbon (GAC) filter cartridge that is designed for the reduction of chlorine, bad taste & odor Series cartridges effectively reduce unwanted tastes, odor and chlorine taste & odor from your drinking water.They are designed to allow maximum contact between the water and carbon, ensuring maximum 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 20-micron post filter helps reduce carbon fines and other suspended particles from the filtered water. The post-filter is permanently fastened to an innovative support basket ensuring that it is firmly secured and eliminating any potential for bypass.