I’m growing in 5 gallon grow bags with Foxfarms ocean forest soil. I have been giving my plants 4 red solo cups of ro water with 4-5 ml of cal-mag per gallon every day. I pH my water at 6.2-6.8. Although, I did not give my plants cal-mag until after two months of veg. I have been giving my plants cal-mag for about 3 weeks now. Thanks for your time.