Greenpassion, I use 3gallon smartpots, with 3lbs, or 21 cups of KindSoil on the bottom of the pot, then you use stuff like Coco-Loco, or Roots Organic or FFOF or Ffhf, or anything you like on top of the pot.
I don't transplant anymore, I can't tell the difference, except I'm not slowing my auto down, an I know you can transplant one without slowing it down, if your careful,
But Phil Kind has got his soil figured out , by using a pound of KindSoil for every gallon of pot size.
At the end your leaves will start turning yellow, just like they do naturally outdoors in the wild.
Thats why he says never water to runoff, or you will wash all of the good stuff that's in the KindSoil away, unless you put a saucer under your pot ,so it can wick it back up.
But I never water to runoff, I put my hand under the pot. And you can feel when the roots are wet-damp.
But if you water to runoff your leaves will get yellow. Much to soon.
Thats why I say, if you follow Phil's directions ,you can't go wrong. But with his soil you do have to make sure that your water is between 6.0-7.0 going in.
It grows some fine sticky weed, too.
ps- oh yeah, no need to flush, last week or two, mine just get molasses an water.