Type Of Acid To Use

I have an in ground pool with a salt system. I have had trouble maintaining the pH level.


What type of acid works best?




Normally, muriatic acid is used to lower the level of pH and alkalinity.

Muriatic Acid

pH
Swimming Pool pH Levels

Pool pH

I'd like to ask what is the level of the pH and why do you think it's going up so fast? What are your other readings?

I'd like to have your complete chemical readings:

Chlorine, CYA (cyanuric acid/stabilizer), pH, Alkalinity, Calcium Hardness, and Metals (iron and copper).
It makes troubleshooting much easier and the process of clearing up your pool will go much faster. You can get this done at your local pool store.

Without these numbers I'm just guessing at what the problem is.

If the alkalinity is out of whack then that will affect your pH, along with high fill water pH level.

Get back to me with the chemical numbers and I'm sure I can help.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Swimming Pool pH" category.

Swimming Pool Questions & Answers

Check back to this post for updates or answers.

Hope this helps and have a great Summer.

Robert

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Liquid Pool Acid Or Powder?

by Larry
(New Orleans, LA)

Is it harmful to use liquid muratic acid on an above ground vinyl pool as compared to the powder form?




Thanks for the question Larry

Either powder or liquid acid will work to lower the pH and alkalinity. I think your concern would be which one is safer to use on vinyl because of the possibility of burns or the bleaching of the vinyl. Both liquid and powder are safe to use, but my preference would be powder.

I used Easy Acid from United chemicals when I was taking care of pool in Arizona. The powder form is safer and much lighter to carry around than an 8 lb. gallon of acid. This came in handy when I was doing 50 - 60 pools per week. From an economic stand point, I think the liquid is a bit less expensive.

The main thing to know is that acid, no matter which form you use, is heavier than water and will sink to the bottom. To lower the pH you would add the acid to a bucket filled with water and broadcast that around the perimeter of the pool with the filter running, then sweep the sides and bottom.

For the alkalinity, you add the acid in one spot with the pump off. You still sweep, but very gently. This will keep the acid from pooling in one spot, but you'll still lower the alkalinity.

pH
Swimming Pool pH Levels

Pool pH

Alkalinity
Pool Alkalinity

Total Alkalinity

Hope this helps and have a great Summer.

Robert

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Type of PH- Sodium Bisulphate or Regular Sulphuric Acid

by Simon Spragg
(Jalon valley SPAIN)

I live and work in the Jalon Valley SPAIN. I manage 53 pools. The question is about pH reduction. Sodium bisulphate is much more expensive. A product called "salfumante" essentially sulphuric acid.
Both work. Your opinion is much appreciated.




Hello Simon. Yes, you can use sulfuric acid in the pool to decrease the pH. The only drawback is it will increase the total Dissolved Solids (TDS) a bit faster than using muriatic acid. Both sodium bisulfate and sulfuric acid will increase the sulfates in the water. What the reading must be in order to cause any issues is debatable.

I'm not familiar with the particular brand of sulfuric acid that you mention but the important thing to remember is to know the ingredient. It says sulfuric acid so you can use it to lower the pH. Just be sure to apply it correctly and safely.

Robert

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