Can you test this overnight sample with the normal range Ph test?
Also, I asked previously about GH and KH but so far these have not been provided. We must know these values in order to deal with the pH issue as they are connected.
Also, I may have mentioned this but maybe in another thread so I'll repeat, is your water authority adding anything to raise pH?
I will leave another sample out overnight and test tomorrow with normal range. I checked my water companies page online for readings but did not see GH and KH. I am using the API kit, but it didn’t come with anything to measure those. Any recommended kits I should pickup for that? I also did not see anything online about PH being added.