Hi
I was also giving my plants mineral water and nutrients. The water started off at PH 7 ( it says it on the bottle) however when I added the nutrients it drove the PH to over 8. I didnā??t have a digital PH reader until my plants really started to develop all sorts of issues.
Most of these issues where quickly resolved after I purchased a digital PH meter. Now Iā??m sure my plants are getting their feed at the correct PH and the run off can also be checked.

Itā??s a fundamental to get the PH correct, so I found out the hard way