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One two-cell, open-draft comfort-cooling tower located at a major corporate headquarters building. The cooling system capacity is 500 tons with an approximate volume of 4,000 gallons. The cooling tower basin had been coated with Belzona.
The tower basin had a severe growth of algae due to the lack of a consistent biocide program. The tower basin was physically cleaned but algae would continue to return. A number of different biocides were tried to bring the situation under control. Both bromine and chlorine based biocides were slug fed into the system but results were not satisfactory. A special biofilm cleaner was added along with liquid bromine but results were still poor.
A new biofilm and algal mat cleaner, Chemtex C-364, was added to the cooling system at a dosage of 500 ppm. The cooling tower basin was swept with a stiff broom to loosen the algal mat. AA-6090M was added to the system to provide a continuous level of bromine in the cooling water. The algal mat was removed and regrowth was kept to a minimum. After five weeks of feeding C-364 in conjunction with AA-6090M the algae problem had not returned.
An extremely hard to control algae growth was removed and brought under control with the use of Chemtex C-364. Biocide consumption was drastically reduced. The cooling tower basin remained essentially free of algae growth resulting in a cleaner more efficient system.
NOTE: Do not use Chemtex C-364 in conjunction with a glutaraldehyde-based biocide.