Ok, here's where we stand. Current FC is 16.5 -- Target FC is 16.
Recap of the day (Overcast all day long, not a spot of sunlight):
6 am -- FC 7.5, overnight loss of 2 ppm, added 3 gallons of 10% as calculated by PM.
8:30 -- FC 21, whoops! Maybe pool size is off?
10:30 -- FC 19.5
1:30 -- FC...