pH goes down in the afternoon?

[Nerdy]

Hello all,
So I got a blueriiot last year (amazing little thing), which gives me a nice profile throughout the day and nights of a few things, including the pH. I noticed this year that my pH goes down a tiny bit during the afternoon (less than 0.1 unit), then goes back up at night/morning. I'm thinking maybe because of temperature fluctuation, but this is a little much variation for just a few degrees up and down in temperature. Any idea why?
Also my pH is trending up over the days (meaning it goes up a tiny bit more during the night and morning than it goes down in the afternoon), and gains 0.1 unit every 2 days. Clearly not a major drift, and easy to correct once it gets out of range, but I'm curious. for the reason why.... Thanks in advance for the responses!

 

[Newdude]

Hey Nerdy !! *Username checks out* Have a gander here : The Effects of Temperature on the pH of Water

It has a small effect undetectable by most. Your tester is either surprisingly accurate, or it’s trying too hard to be exact. Or a little of both.

 

[Nerdy]

haha Thanks Newdude. Great read, thank you for sharing!

 

[Mark929]

Hello all,
So I got a blueriiot last year (amazing little thing), which gives me a nice profile throughout the day and nights of a few things, including the pH. I noticed this year that my pH goes down a tiny bit during the afternoon (less than 0.1 unit), then goes back up at night/morning. I'm thinking maybe because of temperature fluctuation, but this is a little much variation for just a few degrees up and down in temperature. Any idea why?
Also my pH is trending up over the days (meaning it goes up a tiny bit more during the night and morning than it goes down in the afternoon), and gains 0.1 unit every 2 days. Clearly not a major drift, and easy to correct once it gets out of range, but I'm curious. for the reason why.... Thanks in advance for the responses!

Hi.
I got one of these at the end of July. My ph swings from 6.2 to 7.5 and back down again randomly. I’m trying to get it replaced. I also have the eXact pool tester and take samples in regularly. I find the ORP believable. It moves quit a bit - up overnight and down during sunlight. But the ph can swing a full “1” in an hour when nothing is added to the pool.