1. Sewage treatment.
2. Treatment of water (chlorination) at the waterworks.
3. Removing rust from metal e.g. descaling iron before it is galvanized or and other metals before they are electroplated.
4. Making dyes, drugs and photographic materials like silver chloride on photographic films.
Jonmhumble answered the question on March 4, 2018 at 13:20
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