I want to take some ici for last watering but i have to contrôle the ph ??? If i but them in market is no a problème or i have to make them my self to contrôle ph ??
Its a waste of time, there is no substantial proof that shows any positive effects in terms of terpenes, yield or bud quality stressing the roots with ice/dark period/flushing.
Use ice water. Can adjust the ph after scooping ice out. Should easily stress roots and be more then enough to trigger plant defenses. Good luck and enjoy the harvest. Happy growing 🌲🌲🌲👊