The carbon block filter is the second stage of your RO or RI/DI system. It is great for removing chlorine, fluoride, pesticides, herbicides, bad taste, odors and other VOCs (volatile organic compounds). The High-Capacity Carbon Block Filter lasts 4 times longer than a standard carbon block filter. It effectively process up to 12,000 Gallons of water (total including product & waste) at 2ppm Chlorine (24,000 Gallons at 1ppm) Better Filters, Better Service! Features – 4 TIMES Longer Life than a Standard Carbon Block Filter! – High-Purity Coconut Shell Activated Carbon Block – Removes 99% of Chlorine, Taste & Odor – Food-Grade, Non-Shedding Polypropylene Fabric to Filter, Carbon Fines, Impurities & Sludge – Captures Impurities for Cleaner Water – Food grade materials, BPA Free & Environmentally Friendly – Silicone O-ring to Prevent Bypass Specifications Max. Water Temperature: 140F / 60C Max. Pressure: 120PSI The 10 X 2 fits the AquaFX Barracuda, Dolphin, Moray, Mako, Octopus, Hammerhead, Great White, Whale Shark as well as most residential RO systems with standard 10 Canisters. Replace every 6-12 months.