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Before diving into cooling tower blowdown, it helps to picture what a cooling tower actually does. Industrial facilities, power plants, refineries, data centers, HVAC systems in large buildings generate enormous amounts of heat from their processes. A cooling tower's job is to dump that heat into the atmosphere using water as the vehicle. Hot water from the process flows into the tower, gets sprayed over packing material, and a portion of it evaporates. That evaporation carries the heat away, co