7.7 is high, it is not your water it must be the way ff makes there nutes.
nothing bad, ff makes really good nutrients I just do not know about them.
What is the pH when you add cal-mag?
cal-mag raises my pH but my base nutes start out very low.
I have read some people add cal-mag and it lowers there pH, I always thought this was crazy but it might be because there nutes start out high.