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on Sept 28, 2021
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Intel breaks ground on $20B Arizona plants as U.S....
As mentioned, they are used to clean / wash off chemicals from wafers. And not just any water, but Ultrapure Water [1], it is an actual terminology, not marketing speak.
[1]
https://en.wikipedia.org/wiki/Ultrapure_water
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[1] https://en.wikipedia.org/wiki/Ultrapure_water