MIMedGrower
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That's exactly what it's says don't try to pull a fast one. It says less minerals produce black ash. You said not flushing produces black ash. Those contradict each other and your anecdotal evidence is just that. I'm still trying to figure out who invented flushing because nature didn't.
first time I heard of flushing was with indoor volume growers in New Jersey in the nineties. They said they can pump the plants full of nutrients and then flush them out at the end so the weed tastes and smokes ok for a faster turnover.