water curing, be it leaf, bud or trim, is a process to use osmosis to get the excess nutes and other shite in the plant matter to migrate to the water...
To water flush I use bottled spring water if I can, my tap water is horrible, but whatever water I use, I measure the ec/ppm first....place the plant matter in and hold it under the water...an envelope made of flyscreen with a weight in it works for me.
empty and replace the water ever 24 hrs....check the ec/ppm of the 'used' water and after 4-7-10 days the ec/ppm should begin approaching that of the clean water used.
Keeping the plant matter submerged and the water between 15*C-25*C should be the sweet spot I would imagine.
TLBWP