![]() ![]() A typical online disinfection basically amounts to maintaining a free chlorine concentration of approximately 5 parts per million (ppm) for at least 6 hours. A full offline disinfection and cleaning is more thorough but is expensive and presents some serious risks, as discussed below.Īlthough the online method does not address the physical cleaning of the cooling tower, it is effective in killing Legionella and is much safer, cheaper, and quicker. ![]() The offline procedure involves shutting the cooling tower down and scrubbing it physically in addition to disinfecting it with chemicals. Cooling towers can be disinfected “online” or “offline.” The online procedure involves only chemical disinfection while the cooling tower is operating. Perform “online” rather than “offline” disinfection unless full physical cleaning is absolutely necessary at the time. Bassett’s August 6th order to disinfect their cooling towers:ġ. New York City building owners should consider six key safety precautions in complying with health commissioner Dr. ![]()
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