Read
THIS.
It was written because people fuck up watering all the time. With soil, the main thing is to get all the soil wet when you water, then don't water again until the soil is near completely dry. That's why people here are telling you to determine if you need water by the weight of the pot. And you obviously need to know how much the pot weighs when it's full of soil, but dry. You are comparing everything to that.
Cannabis roots need both water and air. Water and air share the same space in soil -- the "pore space" between soil particles. When the soil is wet, there's no air. The plant can deal with the lack of air for about a day or two, then the soil better be drying out, or the roots will die and rot.
Over watering is watering too often. If you water every two or three days, you are eliminating the air in the soil each time, and the roots will never get the air they need.
Another thing to consider is that peat-based soils, like
FFOF, actually REPEL water when they are dry. So when you water until the water dribbles out the bottom, the water may be bypassing dry soil and going directly out the bottom. It is sometimes necessary to put cloth pots in a pan and let them absorb water from the bottom. After you are convinced you've wet all the soil, remove it from the pan and put it back on your elevators.
Keep in mind that roots will not grow into dry soil. Roots grow toward moisture. If you end up with pockets of dry soil that never get wet, you will find there are no roots in it, and from the plant's point of view, it was growing in a smaller pot with less soil.
