CAL-MAX

so you have hard water formula nutes, then don't do the reverse osmosis or the cal mag. Just add your other nutes and go.

My water source is distilled with a TDS of 0. I can't use my city water anymore, my plants got hard water burn and hence why I switched to distilled in the first place.

Now, I'm in a tricky situation..My water was is too pure so I have to add the calcium, magnesium and iron back into it. My city water used to be 400-600 ppm so I'm gonna try to get my 15 gallons of water to 210 ppm of the CAL-MAX.

When you start with nothing in the water your in control. 210 to 300 is what your looking for. You got it Bro. Rock on.