Complete Water Solutions was contracted to clean (2) towers. We contracted every year to clean the towers and make sure there are no major issues with fans, pumps and other equipment. “Cooling towers should be cleaned and disinfected at least twice a year. Normally this maintenance will be performed before initial start-up at the beginning of the cooling season and after shutdown in the fall.” – The OSHA Technical Manual – Section III: Chapter 7 (Table of contents: V)