Replacement RO Post-Carbon Filter for standard 75 GPD RO Systems Reverse Osmosis is a filtration method that uses a 0.0001 Micron membrane to filter out nearly all contaminants from your water supply. For an RO system to produce water with the best possible taste, a post-carbon filter should be used to remove any residual odours and improve the water's taste. The WaterCare post-carbon filter uses Granular Activated Carbon in order to ensure maximum contact time between the water and the carbon granules, producing pleasant tasting drinking water. This membrane fits all standard 75 GPD RO systems. A Quality Product brought to you by WaterCare. #WaterCare #Water #Filtration #Filter #Reverse #Osmosis #Membrane