Quote Originally Posted by herbie the love bud
The optimal numbers depend on the plant. What you need to do is follow your nutes recipe. If it seems like your plants can take more than increase until u burn the tips a little then back off a bit. Use that as your baseline and follow the recipe at that ratio.
I agree and would add. What is your starting point? Starting with 0-50 ppm RO water will allow for more Nuts than some hard waters. I would never go above 1500ppm unless your plants seem to like it and you have some hard water. with an RO I would stay 1000-1500ppms! Hope that helps!