Has this ever been measured? Finished filling the pool yesterday. Tuesday I started adding CYA and I added Metal Free. Before the CYA I tested out the pH at .2 points above nominal - based on readings from testing my well water last season this is accurate. When I tested yesterday it was reading .8 points below nominal. I added Borax accordingly and the pump has been running overnight. This morning the reading appears unchanged so either
a) pH was actually lower than that (My water drop test kit has me comparing colors) and more Borax is needed
b) the CYA is still dissolving and therefore still keeping pH down
On a side note, I added enough metal free to treat the 3400 gallons still having another 800 or so gallons to go. Did I waste some of it? Or if there's too much will the unused part sit there waiting for water to treat?