Gravity Based Offline Water Purifier. Total Tank Capacity 20 Litres. 6 Stage filtration process. 100% iron removal. Filters - Sediment, Tourmaline Balls, Nano Silver-Impregnated Activated Carbon, SS Screen.Tourmaline balls for improving body metabolism. Membrane Type - Hollow Fibre UF Membrane. Expected Life of UF Membrane - 4000 litres.