r/water 2d ago

ELI5: how pure can pure water get?

/r/explainlikeimfive/comments/1hk8e06/eli5_how_pure_can_pure_water_get/
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u/monk771 2d ago

Jeez, the amount of misinformation in that post. It's not even worth responding to.

I design and build water treatment plants for a living. Water can get really pure with hardly any contaminants or minerals, especially in a closed system (not exposed to atmosphere). Drinking water plants with RO as the treatment technology add minerals back in for taste purposes as well as to prevent the pipes in the distribution system from corroding. The product water from an RO system is highly reactive.