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Onetap1 t1_j8hqn3v wrote

Reply to comment by Elfich47 in What do bacteria living in mechanical ventilation feed on ? by malahchi

The cooling towers weren't 'properly maintained' by modern standards because the hazard wasn't recognized.

Cooling towers mostly vanished from AC systems in subsequent decades because the maintenance & chemical water treatment regimes are now so onerous and expensive. Air cooled condensers are more usual now.

Similarly, spray humidifiers were replaced with steam humidifiers, etc..

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