Hydrogen peroxide also destroys free chlorine instantly when pH > 7
(which all tap water is), and it's something that you can find for about
$1/L-in-the grocery store. It only takes about 1/4 teaspoon per 100
gallons to remove 3 mg/L chlorine. In the case of sodium hypochlorite
(bleach) the result is sodium chloride, oxygen, and water (H2O2 +
2NaHClO -> 2H2O + O2 + 2NaCl) It doesn't work on chloramine to my
knowledge though.
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