The Pentek GAC-10 water filter reduces chlorine taste and odor in your drinking water. The Pentek GAC-10 water filters produce healthier, better-tasting drinking water. The Pentek GAC-10 filter cartridge has a 20 micron post filter that reduces carbon fines from the drinking water. The Pentek GAC-10 water filters are designed to allow maximum contact between the water and carbon, ensuring maximum adsorption. The Pentek GAC-10 water filter change interval varies based on your water supply and water usage.