AquaZone Deluxe 50—50 mg/hr Ozonizer/Controller plus Pinpoint ORP Probe and 250cc Air Drier. **** PRODUCT MANUAL **** Applying ozone to your tank raises the ORP, increasing oxygen levels and decreasing dissolved wastes; ozone also effectively kills numerous harmful pathogens. AquaZone ozonizers corona discharge technology provides higher ozone concentration than UV bulb style ozonizers and allows variable ozone output. Just dial in the amount of ozone that your tank needs! * Automatically controls the flow of ozone according to a pre-set ORP * Easy to read backlit digital display * Easy adjustment of ozone output and desired ORP * Continuous display of current ORP * Safe and easy to use. * Includes 250cc Air Drier 1-year manufacturer`s warranty from date of purchase.