Aqua Pure PRO-11G 41 Liter Reverse Osmosis Water Tank Reverse osmosis systems usually have a small water output, you depend on the membrane installed in the system and the user of the filter will have to wait a long time to fill a glass with water , the solution is provided by the water storage container that ensures a constant flow of water. Characteristics: Container capacity 41 Litres. Dimensions in mm (Height-diameter): 500 X 380mm Vacuum: 0.5 bar