Abstract: :Generally, bacteria can be effectively filtered by RO water purifier. However, the pipeline from RO membrane outlet to faucet is easy to breed bacteria, which have potential risk of bacterial breeding and affects the quality of outlet water. There is a tank type reverse osmosis water purifier, the pressure tank or water tank is easy to breed bacteria, so the floating type UVLED device can be used for efficient sterilization of water tank; The no tank type reverse osmosis water purifier, the pipeline from RO membrane outlet to the faucet and the post active carbon are easy to breed bacteria, and the UVLED faucet can be used for sterilization, so as to ensure the safety of outlet water.

Key words: Bacterial breeding, The floating type UVLED device, UVLED faucet