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Vontron RO-2012-150 membrane with a nominal capacity of 150 gpd or 150 gallons per day (567 liters) under optimal conditions. Suitable for desalination of water up to 1500 ppm. Suitable for all reverse osmosis systems, both aquarium osmosis and all home food osmosis. This is the standard 18/12 size which is 1.8 inches in diameter and 12 inches in length.