Radiant-25 controls a wide variety of algae, bacteria and fungi found in the industrial cooling water system. It is a high performance broad spectrum, anti-microbiological agent based on the proven isothiazolone chemistry. It is compatible with chlorine/bromine, corrosion and scale inhibitor. It is non-foaming. It remains active for long periods of time in the water system resulting in low service cost. It readily penetrates the surface of adhering biofilm to give effective control of sessile micro-organism. It is highly effective over a wide range of pH.