20 inch Granular Activated Carbon filter cartridges. Removal of chlorine, pesticides, organic compounds, odours and taste. For complete listing of compounds removed please contact us for additional information. Suitable replacement filter for many water systems and filter housing manufacturers. Due to granular construction affords significant surface area for absorption of contaminates over carbon block filters. Filter can be used as a polishing filter after reverse osmosis, distilation systems or other various water treatment processes. High quality of construction at an inexpensive cost. Provides great tasting water for pennies a gallon.