My area water has insanely high alkalinity and hardness. My local neighborhood grocery store offers RO water through a machine that is routinely cleaned and maintained.
Testing this RO water with my Taylor test kit (for my spa) I find unmeasurable hardness, but the alkalinity is 55. Bruin'water defaults RO water alkalinity at 13. This is a significant difference in adjustments.
My question: Unlike distilled which is flat-line, is there a significant difference in RO water profiles based on the existing profile of the water running through the machine?