APEX RF-1001 Inline GAC Filter Coconut Shell Granular Activated Carbon Filter for Reverse Osmosis Systems and Distillation Units & Other Water Filtration Systems 1500 Gallon Capacity. (6-12 months) Chlorine, Taste & Odor Reduction Inlet & Outlet Size - 1/4 inch FPT x 1/4 inch FPT Flow rate: 0.75 gpm