Because chloramine is a chemically bound compound, the chlorine will not dissapate but remain bound to the ammonia if left to sit.
Years ago, when only chlorine was used in Edmonton's tapwater, if tapwater was left to sit, indeed the chlorine would dissapate and there would be no ammonia present.
Using a dechlorinator designed for use with chloramine, such as Prime and Amquel (and probably others), will neutralize the chlorine and convert the toxic ammonia to non-toxic ammonium.
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