Reports on a pilot cooling tower apparatus closely simulating the operations of a typical light industrial cooling water system and a HVAC system which was set up to study the scaling of heat transfer tubes in the presence of 0.1 ppm concentration of ozone. Running times ranged from 432 hours to 1,800 hours. Finds that at 0.1 ppm ozone concentration, the ozone has little effect on the scaling behaviour of heat exchanger copper tubes. The traditional forces that cause scaling are still the dominant factors regardless of the presence of ozone (at a 0.1 ppm level.

KEYWORDS: year 1996, Ozone, antiscale, scaling, laboratory testing, experiment, copper, tubes, heat exchangers, cooling, water