![]() 10.5 lbs domestic grade NaOCl per 1,000 gallons of CT/EC water or.3.0 lbs industrial grade NaOCl per 1,000 gallons of CT/EC water.Examples of disinfectants include sodium hypochlorite (NaOCl) or calcium hypochlorite (Ca2), calculated to achieve initial free residual chlorine (FRC) of 50 mg/L: either Use EPA-registered products, if available. Add fast-release, chlorine-containing disinfectant in pellet, granular, or liquid form, and follow safety instructions on the product label.Perform these chemical disinfection procedures. Continue operating pumps for water circulation through the CT/EC.Close building air-intake vents within at least 30 meters of the CT/EC until after the cleaning procedure is complete.Shut off the automated blowdown controller, if present, and set the system controller to manual.Shut off the system blowdown (i.e., purge) valve.Shut off fans, if present, on the cooling tower/evaporative condenser (CT/EC).Protective equipment may include full-length protective clothing, boots, gloves, goggles, and a full- or half-face mask that combines a HEPA filter and chemical cartridges to protect against airborne chlorine levels of up to 10 mg/L. Provide protective equipment to workers who perform the disinfection, to prevent their exposure to chemicals used for disinfection and aerosolized water containing Legionella spp. ![]() Perform these steps prior to chemical disinfection and mechanical cleaning. ![]()
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