PH Help

Shablam

LifeTime Supporter
Jul 26, 2010
55
Flower Mound, TX
Numbers:

FC - 8
CC - 0
PH - 7.8
TA - 120
CH - 250
CYA - 70

I am having a issue with the PH in my pool; no matter how much acid I put in the next day it shoots back up to 7.8 +. Yesterday I put 35 oz per the pool calc of acid to lower to 7.2. Tested a few hours later and it only dropped to 7.5. This morning it is back up to 7.8.

I am mixing in a 5 gallon bucket with pool water and pouring slowing by return jets in the pool. Has anyone ever had this trouble or found the best way to lower? Or has anyone ever experienced spikes in PH such as this?

Thanks for the help ;)
 

Richard320

TFP Expert
LifeTime Supporter
Jan 6, 2010
20,977
San Dimas, CA (LA County)
Sounds normal to me. You still have fairly high TA, and the spa waterfall aerates things. Just keep it up and eventually things will settle down. I use a lot of acid, but I did slow things down by adjusting the valves so the spa only gets about 10% of the flow. It doesn't look like it's at a boil anymore.

You might want to double-check the label on the acid, it might be weaker than you think.
 

dmanb2b

TFP Expert
LifeTime Supporter
Apr 4, 2009
3,734
NY
Yup, what Richard said....you may want to lower your TA to around 70 if you have a SWG and use your water features often. Aeration/SWG and New plaster raise PH and you can combat this by running a lower TA.
 

257WbyMag

TFP Expert
LifeTime Supporter
Feb 23, 2008
5,061
Denton, TX
If, after lowering your TA, you still have trouble with pH rise, you can consider the addition of borates to your pool. I think though, that when your TA gets down to around 70, things will be much better for you as far as pH rise is concerned.
 

Woodberg

Well-known member
I would also recommend lower your TA. I had the same issue with constantly rising PH and I've now got my TA at 60. My PH level is a lot more constant at around 7.5. I only have to add acid 1-2 times per month.
 

kal2002

LifeTime Supporter
Jul 4, 2010
235
northern California
Hi everyone. I am having the same problem. I quit shocking the pool for mustard algae on August 7. I let the chlorine come down to 6. I tested pH eversince and it has been at 7.8 or 7.6. The color of the test sample is always more red than the block so I assumed it is higher than 7.5. I started to add muriatic acid when FC came down to 7.5 to try to bring pH down to 7.4 or 7.3 but no luck. Every night since then, it has tested high. My test results are:
FC - 6
CC - 0
PH - 7.8 or 7.6 can't really tell but it is not 7.5
TA - 90 - it was 100
CH -350 or 375
CYA - 40

I have used almost 2 gallons of muriatic acid since I quit shocking and the pH is still high. What am I doing wrong? Do I need to lower TA to 70 like shablem to keep pH from increasing? Any suggestion will be gratefully welcomed.
 

Richard320

TFP Expert
LifeTime Supporter
Jan 6, 2010
20,977
San Dimas, CA (LA County)
kal2002 said:
Hi everyone. I am having the same problem. I quit shocking the pool for mustard algae on August 7. I let the chlorine come down to 6. I tested pH eversince and it has been at 7.8 or 7.6. The color of the test sample is always more red than the block so I assumed it is higher than 7.5. I started to add muriatic acid when FC came down to 7.5 to try to bring pH down to 7.4 or 7.3 but no luck. Every night since then, it has tested high. My test results are:
FC - 6
CC - 0
PH - 7.8 or 7.6 can't really tell but it is not 7.5
TA - 90 - it was 100
CH -350 or 375
CYA - 40

I have used almost 2 gallons of muriatic acid since I quit shocking and the pH is still high. What am I doing wrong? Do I need to lower TA to 70 like shablem to keep pH from increasing? Any suggestion will be gratefully welcomed.
Nothing. Yes.

2 gallons isn't bad for a pool your size, if it was neglected a while. It took me that much to get my pH to 7.8 and my pool's only 16000 gallons!

Use 7.4 for your pH target when you use Pool Calculator, then you'll know when it's below 7.5. Unless you're impatient to lower TA, then go to 7.2 and aerate the water. But it will come down given time, as long as you keep adding acid to maintain pH.
 

Shablam

LifeTime Supporter
Jul 26, 2010
55
Flower Mound, TX
Ok I am back.

I have maintained TA at 70 since a few days after posting. The PH still seems to want to settle at 7.8 now matter what I do. I am at a slight loss here. Any thoughts or ideas what might be the cause?

I am also wondering how long I should leave TA at 70 since it is not a salt pool.
 

Bama Rambler

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2009
23,062
SouthWest Alabama
You can leave the TA at 70 forever if that works for you. However if your pH is still rising you can try lowering it to 60 to see if that helps.

Another note is that if your pH stays at 7.8 and doesn't go higher why not just leave it there? There's nothing that says it has to be lower.
 

Shablam

LifeTime Supporter
Jul 26, 2010
55
Flower Mound, TX
Well i guess you are right. I thought that a proper level was around 7.2 to avoid skin irritation. It does seem like no matter what, the pool wants to sit at 7.8 and even when I get it down to 7.2 by the end of the day it is right back at 7.8.

Seems like when I get the PH down the water feels better but thats probly in my head, ever since I got my test kit I have become obsessed with numbers.

Thanks for the help.
 

dmanb2b

TFP Expert
LifeTime Supporter
Apr 4, 2009
3,734
NY
Fastsporty77 said:
My pool is salt gen. and my Ph always is 7.8 and I add a half gallon of acid twice a week.

You mean in order to maintain PH of 7.8 you need to add half a gallon of MA twice a week? Not sure I understand you're post. You likely have high TA.
 

acroy

Well-known member
May 11, 2010
186
Dallas TX
I have a 33k gunite pool, swg, and go through about 1gal of muriatic acid a week (via diy dosing system) to keep pH about 7.5.

50ppm Borates and TA about 70

This spring, when 'opening', the pH was around 8 (I let it get away from me over the winter), TA around 120, zero borates. It took a lot of adjustment to get it steady where it is now.

best of luck
 

Johnny B

LifeTime Supporter
Mar 19, 2009
563
Charlotte, NC
I was/am going through very similar pH issues as many here mention. You can read about it here, starting on my post of Aug 4, 2010 to see the help I got:
pool-opening-for-the-season-t19772-60.html

Its a learning experienc about how TA & borates & pH relate.

One guy on this thread mentioned "ok to leave pH at 7.8". I suppose fine if you can keep it there but if its creeping up then it'll exceed 7.8 & you can run into a scaling issue ( I did over the winter when I neglected my pH, the link to that issue is in the above thread)
 

Fastsporty77

Member
Sep 22, 2010
12
central florida
dmanb2b said:
Fastsporty77 said:
My pool is salt gen. and my Ph always is 7.8 and I add a half gallon of acid twice a week.

You mean in order to maintain PH of 7.8 you need to add half a gallon of MA twice a week? Not sure I understand you're post. You likely have high TA.
Yes that is what I mean a half gallon of MA twice a week to maintain the PH to 7.5-7.8
I just got my Taylor TF-100 test kit so will do a more through exam. today. If I have high TA the MA should help with that? I use the spa jets/air blower some too which should also help I thought, am I correct here folks?
 

dmanb2b

TFP Expert
LifeTime Supporter
Apr 4, 2009
3,734
NY
High TA would cause PH to rise as well as the spa jets jet and blowers.

High TA coupled with a SWG and aeration tend to push PH up. Muratic acid lowers both PH and TA. Eventually as your TA drops and if you cut back on aeration, you should see your PH starting to stabilize :goodjob:

For now though you are on the right track...eventually you should require fewer and fewer acid additions.
 

Fastsporty77

Member
Sep 22, 2010
12
central florida
dmanb2b said:
High TA would cause PH to rise as well as the spa jets jet and blowers.

High TA coupled with a SWG and aeration tend to push PH up. Muratic acid lowers both PH and TA. Eventually as your TA drops and if you cut back on aeration, you should see your PH starting to stabilize :goodjob:

For now though you are on the right track...eventually you should require fewer and fewer acid additions.
Gees I hope. thanks. :goodjob:

Just tested with the basic kit at
CC 2
PH 7.5 - 7.8
That is up from this am.
 

kal2002

LifeTime Supporter
Jul 4, 2010
235
northern California
Shablam said:
Ok I am back.

I have maintained TA at 70 since a few days after posting. The PH still seems to want to settle at 7.8 now matter what I do.
Yeah, I am back too. When I posted on August 17, 2010, my test results were:
FC - 6
CC - 0
PH - 7.8 or 7.6 can't really tell but it is not 7.5
TA - 90 - it was 100
CH -350 or 375
CYA - 40

As if this morning they are:
FC - 9.5
CC - 0
PH - 7.8 or 7.6 can't really tell but it is not 7.5
TA - 80
CH -330
CYA - 40

The PH is still at the high end. I quit testing for PH everyday. I only test it weekly and add muriatic acid weekly to try to adjust it to 7.4 or 7.5 but it always goes back to almost 7.8 no matter how much acid I added. Also, I thought after adding so much muriatic acid, the TA level will decrease. It hasn't. It has been at 80 for a few weeks now.
 
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