This ozone sterilization unit (B-A01 Heat Pump Ozonizer) is an inexpensive solution to help keep a steam room, steam shower, whirlpool bath or hot tub free from bacteria , virus's and algae. While it helps in reducing these problems the product you have should also been cleaned regularly to keep any harmful bacteria and virus's to a minimum. The ozone sterilization will start once the steam session has finished and the unit is turned off. It will run for approximately 15 minutes creating a buzzing sound - this is normal.It's a fantastic addition to any wet environment as it will help you keep on top of cleaning.This bathroom ozonizer works by converting oxygen into ozone. On a steam shower or steam room this works by pushing the ozone down a pipe which is connected onto the ozone outlet which is affixed onto the wall of the steam room.On a whirlpool bath / hot tub, the ozone a pipe will connect from the ozonator to the plumbing system of the spa, where the suction will pull the ozone into the water.The ozone generator is connected to the control system of the steam cabin or hydromassage bath.12Volts AC50/60 HZ