We don't care what you call it, what we don't know is when to change nutrients by what the PPM-etc is. We have not been able to find charts that we can understand.
Do different plants have different levels of ppm they respond to and react to?
I have read many complicated explanations but none that give step by step how to know or an understandable formula.
Maybe someone will come up with a computer program "For Dummies"
At this time we go till the pH starts to drop on it's own, it can't be that simple? If it was they couldn't sell TDS meters.
"Doing 10 with no Chance of Parole"