Three guesses but no idea if any are correct:
1. Being started and stopped manually so is happening during working hours
2. Running 24 hours
3. Want to take advantage of even a little evaporation during daytime
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Why do people insist on making claims without looking them up first, do they really think no one will check? Proof by emphatic assertion rarely works.
Confirmation bias is real; I can find any number of articles that say so.
Victor, NY - Randallstown, MD - Yakima, WA - Stevensville, MD - Village of Hillsborough
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