Any reason pH would suddenly drop?

[Jasontkd]

I am wondering if I am missing something. Other than my pH probe being dirty or needing recalibrated, is there some reason my pH would suddenly drop yesterday?

nothing has changed in my system. I did disconnect my Dos and move it to a different area under my stand. This was maybe offline for 20 minutes during the day yesterday.

however, the change in pH seems to really started occurring two nights ago. It looks like it dipped more than usual overnight

 

[Randy Holmes-Farley Verified Community Expert]

Closed windows?

More people in the home?

Alk dosing messed up?

Skimmer stopped?

 

[Jasontkd]

The house wasn’t closed up any more than usual.

there are only 3 people in the house, but we had been on vacation for the last week. That was our first night back. Seems like a big impact from 3 people.

Alk dosing was all the same.

skimmer is still functioning

 

[Randy Holmes-Farley Verified Community Expert]

The house wasn’t closed up any more than usual.

there are only 3 people in the house, but we had been on vacation for the last week. That was our first night back. Seems like a big impact from 3 people.

Alk dosing was all the same.

skimmer is still functioning

Well, there would be no impact from no people, so going to 3 could be a big change.