pH keeps rising...

cruzmisl

Well-known member
May 26, 2007
185
Hi All,
I have a 20k gallon vinyl IG pool and the pH keeps rising. Any ideas as to why? I had to reduce TA and was aerating a lot which is why it was rising in the first place but I stopped that about a week ago and it still continues to rise.
Here are my particulars

FC-3.5ppm (use a Liquidator with 5.25% bleach)
CC-0ppm
CYA-50ppm
TA-140ppm
pH-7.8 (was 7.2 four days ago after the addition of some acid)

Thanks,
Joe
 

KurtV

LifeTime Supporter
Mar 29, 2007
270
SE Louisiana
I think your relatively high TA is putting upward pressure on your pH. I 'd lower it to something less than 120 and see how your pH trends then.
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,880
Silver Spring, MD
If you have had any rain recently or lots of swiming that would raise the PH through aeration. I would take the TA down to 80 or 90, or you can let that happen over time as you keep the PH under control. PH can drift around for a number of reasons, though high TA seems the most likely cause here.