I assumed letting water stand for 24 hours was to allow the chlorine to evaporate?
Chlorine, as many know, is added to water to kill bacteria and parasites making it drinkable.
Bacteria are required, in terrestrial sediments, to break down (or fix) chemicals which are consumed by the plants.

This means that giving chlorine filled water to ANY plant can significantly affect growth.

Chloramine, on the other hand, is a combination of ammonia and chlorine (much more stable than just chlorine). This acts in the same way as chlorine levels (bacteria depleting/quick evaporation rates) so can be left to stand for ~24 hours, too. If you're lucky enough and the ammonia stays within the water after the chlorine has been evaporated (don't know if this is possible), you have a great nutrient for your plants.

Simply letting the water "stand" will cause the chlorine to evaporate, but creating a lot of turbulation can allow it to evaporate quicker.


Pink.