We water by weight. So if the plant is feeling light we water till it is coming out the bottom. Generally the plant will feel heavy for a day or two and we have to water again. It takes up to about 5 gallons give or take for all 8 of our plants. Sometimes I water and let the container underneath catch it or we will take each plant individually out and set it over a bucket to water. We use the grow bags so it gets more air to the soil but if you don’t water slow enough it comes out all the sides and makes a huge mess. It’s a very timely process. There has to be another way. Any ideas??