pH from 7.3 to 7.9 in 2 months - normal?

[whatdidigetmyselfinto]

Hi there,

Beginning of August i had a pH of 7.3.
When I measured today, it was 7.9.
Is this drift normal?
It is a salt water viynl pool that is known to drift AFAIK, but I didn't expect it to be this much this fast.
I was mostly keeping an eye on FC, not so much on pH.

Full set of numbers :
TA:70
CH: 170
pH: 7.9

Big difference is water temperature which is now around 14C (58F). Is that a factor?

 

[reggiehammond]

TA influences pH. TA - Further Reading

With that said, you've had very little movement compared to most pools, so your TA must be awfully close to equilibrium.
Don't do anything until the pH is no longer in the 7's though.

 

[Rocket J Squirrel]

Yes, normal. Keep muriatic acid on hand to lower pH when needed.

 

[JJ_Tex]

I would say that is way better than normal. The people who have to add acid every 2 weeks or even more often would kill to only have to add acid every 2.5 months.

 

[whatdidigetmyselfinto]

oh wow - ok - so mine is on the good end of the spectrum good to know.

Then I'm going to end this with a question on closing and if any adjustments are needed.
Ill be adjusting the FC and then putting in the PolyQuat 60 but any pH/TA/CH adjustment needed before I do that?
I think my pH will go down during the freezing Ottawa winter, so maybe keep it all as is then ?

 

[JJ_Tex]

I think my pH will go down during the freezing Ottawa winter, so maybe keep it all as is then ?

Typically water only goes up in pH until it reaches an equilibrium. Its probably fine, but I would knock it down a little with acid before closing.