Hi Tim, Zypher,
Thank you both for the advice!
How stable is the ph? Are you adjusting all the time? If so, in which direction?
I just mixed up a new 5 gallons worth of RO water with 0 ppm, added cal mag to 300ppm (x700 EC), then added A+B dutch master gold to 500ppm, PH is 5.8.
usually a...