The AquaFX Granulated Carbon GAC Filter 20 x 2 serves as a critical second stage in your reverse osmosis or RO/DI water purification system. This high-performance filter is engineered to effectively remove a wide range of impurities including chlorine, fluoride, pesticides, herbicides, unpleasant tastes, odors, and other volatile organic compounds from your source water. It is capable of processing up to 5,000 gallons of water at 2ppm chlorine, or 10,000 gallons at 1ppm, ensuring clean and safe water for your delicate reef environment. Crafted from sustainable source coconut shell carbon, this filter boasts a 30% longer lifespan compared to standard carbon blocks. It is hand-packed in the USA and designed with a refillable shell for convenience. Key specifications include a maximum water temperature of 140F (60C) and a maximum pressure of 120PSI, ensuring robust performance under various conditions. This filter excels at removing 99% of chlorine, taste, and odor, providing superior water clarity. This 20 x 2 inch AquaFX GAC filter is specifically designed to fit AquaFX Blue Marlin RO/DI systems, as well as most residential RO systems equipped with standard 20-inch canisters. It is an essential component for any serious reef aquarist, guaranteeing that only the purest water enters their aquarium, which is vital for the health and vibrancy of sensitive corals and marine life. For optimal performance and consistent water quality, it is recommended to replace this filter every 4 to 6 months.