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The outlet of the RO (if you do not want RO then do not connect the RO membranes) is pumped into a pressure tank. The pressure tank has an inflated rubber balloon into which water is pumped. As the water is pumped the balloon is compressed and under pressure. The outlet of the pressure tank is connected to a faucet in the sink. When you open the faucet the compressed air in the balloon pushes the water out. When the air pressure in the balloon falls below a certain level the pump starts and pumps water into the pressure tank.