I make mine, sort of 3-1-1 and 1-3-2.
I have big multis, vanda and phals and I feed them up to 175 ppm N.
Tap is about 150 - 200 ppm, mostly Ca and Bicarbonate, 7.5 pH. So my mix is intended to buffer the pH down to 6 pH and then some.
The plan is to dilute that mix with rain or distilled for...