Feature： ● Technology corona discharge quartz ozone cel. ● Cooling way:air /water cooling ● Over heat,over temperature,over voltage protection. ● High ozone concentration output:assemble air and water cooling quartz ozone tube for larger modes,both with internal and external electrodes cooled,large cooling area,easy heat dissipation,low temperature rise and high efficiency. ● With refrigerant dryer for cooling air which can protectozone unit for long service life in good working condition. ● With timer:12o minutes /ozone output adjustable