lots of info from different viewpoints but this is what I do. Start using a flush and 3 tbl molasses per gallon to give it sweetness, flush the salts and give it some taste with citric acid. Buy final phase its the most recommended product I know of from any line.IMO Its like twenty bucks a bottle and it will make a giant difference.
Timeline on when to flush should start when the first amber triches show up. I recommend a 20 day flush but some say that is overkill. I don't and so the members at my club can really notice considering how much ferted weed is in a developing med state. Some say a week to ten days with a rinse but they just can't wait. Go 20
Its always better to wait and be a little too ripe than being underdone, get a mag glass and test samples.