An ozone system is to be used in a quarantine unit in which the bivalveArgopectin irradians irradians(Bay scallops) will be held at the Biological Research Station, Ellerslie, Prince Edward Island, Canada.A. irradiansis not indigenous to Canada and, as such, all effluent must be disinfected to guard against the danger of an exotic algae and/or disease, possibly associated with the scallops, adversely affecting the native marine environment. A description of the system, techniques utilized, and test results obtained are presented along with suggested alterations to improve the system.