Root Rot Problem, need some advices.

THCBrain said:

Stop growing in water and use a medium like soil or coco you'll have a much easier run at it, water takes no prisoners and will fuck you up in a heart beat, unless you have everything you need to maintain your water. I made this mistake trying new methods, but I now grow in coco all the time and have 10/10 success rate from start to finish.

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I agree with THCBrain on this one. Coco is your best bet but you may have a hard time finding good quality coco in China. Soil has been used successfully for thousands of years. Nothing tastes better than organic soil grown flower. There are growers here in Oregon that are getting 2lbs per 1000W light using traditional soil and Botanicare Nutrients.

Nothing wrong with switching to soil; it is still a commonly used method for a reason. All about your personal needs.