MIMedGrower
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Ok, so would you think to use a ro/tap mix (not knowing tap contents) to 150? Or use some sort of calcium magnesium supplement on zero ppm ro water?
It doesn't make any sense to me to strip water only to need to add back stuff. But unless you grow in coco you would probably be ok with ro water and base nutes.
Either way I want to know what is in my water first. And I would mix it down with ro water if it was too hard water to 150 ppm or .3 ec before I would try something else.
And if your water is .5 ec or 250 ppm I would use it as is but maybe with hard water nutes or at least nutes with less or no calcium. Also plenty of runoff when watering will help wash out salt build up.
Some growers manage with harder water than that.