SUPERIOR WATER QUALITY: This Aquatic Life Twist-In Unit is a 4-Stage RO reverse osmosis system. Produce up to 75 gallons of filtered water per day with this 75 GPD RO reverse osmosis filter. This ro/di filter system for aquarium water provides optimal filtration for your aquatic environment. MEMBRANE FILTRATION: The RO membrane filter in the reverse osmosis water filtration system reduces Total Dissolved Solids (TDS) from the water down to the ratio of 1 out of 10,000. EFFECTIVE SEDIMENT REMOVAL: The sediment filter in the RO water filtration system captures sand, silt, and more, which affect the quality and appearance of water. CARBON BLOCK FILTER: The carbon block filter in the RO water system eliminates chlorine and conditions water before it reaches the RO membrane. COLOR-CHANGING DEIONIZATION FILTER: The mixed-bed deionizing water filter in the RO reverse osmosis water filter system employs Cation and Anion beads to remove any remaining TDS from the membrane-filtered water. The Aquatic Life 75 GPD reverse osmosis deionizing water filter system offers superior water filtration, providing up to 75 gallons of clean, filtered water per day. This high-capacity RO system ensures you have ample filtered water, perfect for aquariums, fountains, humidifiers, and more. This RO water filter system effectively reduces Total Dissolved Solids (TDS), salts, calcium, magnesium, and more from your tap water. This 4-stage filtration system includes a Sediment Filter, a Solid Carbon Filter, a 75 GPD RO Membrane Filter Cartridge, and a Color Changing Deionization Cartridge. The twist-in cartridge design makes filter replacement easy and mess-free, requiring no tools or direct contact with filter media. The Aquatic Life deionization RO filter system comes with all necessary tubing, water supply connectors, and a drain connector, making installation straightforward and quick. With a few simple tools, you can have your water filtration system up and running in just a few minutes, providing you with clean, clear water.