... sterilizing, 24hours UV sterilizing. Sand, corrosion, heavy metal, bacteria, residual chlorine and their derivative, all ... water . Features:Operation Instruction:Features:1.The machine adopts advanced reverse osmosis (RO) filter purification ... effectively remove sand, heavy metal, organic compound, bacteria etc. harmful substance for human body.2.Ultraviolet ray ... 0.01. water vending machine for sale