Maybe I have been getting lucky, but I don’t 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 it’s been more like 3-4 days lately because it’s 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 didn’t use molasses, I guarantee I’d need to flush more often since my city’s water is pretty hard. It seems to work just fine. On my next grow, I’ll do a test on just 1 plant using the 20% runoff theory to see if that improves anything. I understand I’m in the minority on the runoff situation. Always looking to improve yield.