Stainless Steel Hot and Cold Water Dispenser *Water cooler dispenser for school,factory,construction site *RO filter,hot cold TB3000- ... steel free standing drinking purification2. built-in Reverse Osmosis water dispenser.RO system is equipped with Reverse Osmosis mechanism, it's ... of water filtration. It filters water by squeezing water through a semi-permeable membrane, which is rated at 0.0001 micron ...