Ph keeps rising

notenuftoys

Active member
Jun 17, 2011
41
North Texas
#1
What could cause my Ph to keep climbing? I can't get it to stay down at 7.5 for more than a week. It's getting very frustrating.

I have a SWG plaster pool, about 26000 gallons, finished in March of this year.
 

Smykowski

TFP Expert
LifeTime Supporter
#2
Probably the new plaster. I'm not an expert on plaster pools, but if I remember from reading about the issue, new plaster will cause a significant pH rise for almost a year. Lots of MA at the beginning is just part of the process.
 

Rafalski

Well-known member
Jul 2, 2012
75
New Jersey
#4
notenuftoys said:
What could cause my Ph to keep climbing? I can't get it to stay down at 7.5 for more than a week. It's getting very frustrating.

I have a SWG plaster pool, about 26000 gallons, finished in March of this year.
Wow, I thought Ph needs to be adjusted on a daily basis, I would have thought with SWG a week is a great result.
 

Rafalski

Well-known member
Jul 2, 2012
75
New Jersey
#5
Richard320 said:
New plaster, high TA fill water, SWG, any water features like spa overflows or slides.
Richard, you know you look just like my neighbour, the first time I looked at your picture I said what the heck is Brian doing here, he doesnt have a pool.....
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,879
Silver Spring, MD
#7
During the first month or so after fresh plaster is applied, you need to test and adjust the PH at least daily, and sometimes more often. Other than that, daily is recommended, but weekly is usually fine.

I've gone an entire pool season without having to adjust the PH once, though usually I do end up needing to adjust the PH once or twice a year. (I have a SWG.)
 

mhosborn

Well-known member
Jul 2, 2011
311
Broken Arrow, OK (Tulsa)
#8
Our new pool, which was filled with water at the end of January, suffers from the same problem mentioned here, in that the pH keeps rising in it. We have to add about 36oz of muriatic acid roughly every other day to keep it anywhere near 7.4.

I'm told the acid demand will decrease over the first year...and can already see it just beginning to go down a bit.
 

XsAllOverIt

LifeTime Supporter
Dec 8, 2010
560
Mount Airy, Maryland
#9
Well, I've had my pool since August 2010 and I continue to add approximately 1 gallon of muriatic acid about every 10 days to keep my pH in check. I do have an SWG and a waterfall that drops about 1 foot and 1 foot wide. Just a part of doing business. I don't think my plaster is still curing. I don't add anything else regularly, so the cost is minimal.