You know GPS, I actually don't know how much water gets refilled per day. That's a good question. I'll close the water valve tonight and monitor water levels till I redo the reservoir Friday. I'll also watch the EC levels too just to see whats going on.
As far as what is in my city water...I'm not really sure. I've never done a water test. The
City Water Report here lists some stuff but its not very easily digestible to me if that makes sense.