PH rising using alot of acid and not sure why

Claughaun

Member
Jul 10, 2009
15
Topic Split off by Moderator

I'm putting about a Gallon of acid(31.45%) every two weeks in 13,000 gl pool - old plaster, SWG, Borates (50) - not getting used a lot yet this summer. Why is Ph climbing so fast?
 

Richard320

TFP Expert
LifeTime Supporter
Jan 6, 2010
20,796
San Dimas, CA (LA County)
That actually sounds about right to me. Maybe a little high, but not much more than I use. First, I have hard water. If add 2" of fill water I have to add 2 cups of acid just to stay even on pH. Second, I have some real light calcium scaling that is slowly dissolving (we're talking months and months) by keeping pH down below 7.5 all the time. (and brushing with a steel brush) Third, I have to keep water flowing through the spa portion so it gets filtered, and there's no way to stop the bubbles. I have it down low, but it still gets a lot of aeration. Which isn't necessarily bad, as it gets rid of the TA. But it uses a bunch of acid.

Once the TA gets down to about 80, things stabilize quite a bit. But then it gets hot, water evaporates, I add more, and it all starts over again.