Maybe I have been getting lucky, but I donāt water or feed to 20% runoff before the very end when I flush. My plants are in week 7 of flower and I usually give them a little over a gallon of water for a 5 gallon grow bag every 2-3 days, although itās been more like 3-4 days lately because itās very humid and I think the plants are pulling water from the air. The humidity dropped drastically today which is good, got it down to 45% in the room. I can feel the bottom of the grow bag is wet after I water so I stop there. I use molasses on the non-feed days to remove the salt buildup. If I didnāt use molasses, I guarantee Iād need to flush more often since my cityās water is pretty hard. It seems to work just fine. On my next grow, Iāll do a test on just 1 plant using the 20% runoff theory to see if that improves anything. I understand Iām in the minority on the runoff situation. Always looking to improve yield.