it depends on soil/hydro and what strain it is...
you use Cha Ching the last 2 weeks of flower ... then flush for 3 days in hydro, or use a 3-day emergency flush for soil.
You have to know how many weeks they strain you are growing will go, then subtract 2 or 2 1/2 weeks from that then start adding at that point.
And remember-- when figuring how long they are "in bloom"; day 1 is AFTER they begin to bloom, not the 1st day of 12/12!!!
I HIGHLY recommend Cha Ching used this way---it really ups the amount of essential oils in the finished buds (IMO) and using Beasty bloom from week 3 until you start Cha Ching helps even more....
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Through What we create- we are immortal.