The Classic UV 15-Watt Series Units sold by Aqua Ultraviolet are a type of UV sterilizer with ¾ inches plumbs in-line that can sterilize fresh water up to 200-500 gallons with a flow rate of 700 gallons/hr and saltwater up to 75 gallons with a flow rate of 233 gallons/hr. It is also used as a freshwater clarifier for up to 2000 gallons.

The Classic UV 15-Watt Series Units are a reliable, cost-effective, environmentally friendly sterilizer alternative to chemicals and their resulting bi-products.