SUPERIOR WATER QUALITY: This Aquatic Life RO Buddie is a 4-Stage RO reverse osmosis system. Produce up to 50 gallons of filtered water per day with this 50 GPD RO reverse osmosis filter. This ro/di filter system for making 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 resin in the RO reverse osmosis water filter employs Cation and Anion beads to remove any remaining TDS from the membrane-filtered water.