pH Too High In Saltwater

by Roland Blake
(Shawnee, Oklahoma)

My pool is 22x52. My pH is 8.4 and free chlorine is 0/0.

Alkalinity is 80-120. Cyanuric acid is 30-50 and 0 on copper. Water is milky. What can I do? I need help. Live in Oklahoma, it's hot and I need my pool to keep cool.

Thanks for the question Roland

First thing, if all of the other readings are correct, is to get the pH down to 7.6. If the pH gets down to 7.2 - 7.4, don't worry. It will come back up naturally through pool use and splashing around.

You have about a 35,000 gallon pool, to the best of my estimate. It's 12oz. of acid to lower pH 0.2 per 10,000 gallons. You would use about 3/4 gallon to bring the pH down.

Broadcast it around the pool with the pump on, then sweep very well. Allow to FILTER for 8 - 10 hours, then retest and make another adjustment.

You also need to get chlorine in the pool. The CYA is right in line so don't mess with that. It's 3/4 gallon of chlorine per 10,000 gallons to reach 10ppm. You can make this adjustment during the pH decrease. Wait about 3 - 4 hours after adding the acid, then add 3 gallons of chlorine. Sweep very well.

Don't use calcium hypo (chlorine granules). This kind of chlorine has a pH of 12. If you shock the pool you'll be raising the pH again, which is what you don't want to do.

encourage you to get a Taylor K-2006 test kit. And also take a sample of pool water to your local store for analysis. This way you'll know if the readings are correct because you'll have something to compare it to.

Pool Water Testing

Water Testing Kit

If the chlorine holds after shocking, if it only loses 1 - 2ppm, you're on the right track. If you lose more than that, it could be the CYA is either too high or low. Too high, above 70 - 80ppm and you'll need to do a partial drain and refill. Too low, below 20ppm, and you'll need to shock with Dichlor.

This is a stabilized form of chlorine. Once you reach the 30 - 35ppm CYA mark, stop with Dichlor and go back to regular liquid chlorine.

Be careful when using Dichlor as it can get out of hand quickly. For every 10ppm of chlorine added with Dichlor, you'll raise the CYA by 9ppm. For every 10ppm of chlorine added with Trichlor tabs you'll raise the CYA by 6ppm.

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.

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Hope this helps and have a great Summer.


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Salt Water Indoor Pool With High pH

by Adel

I have a constant PH at 8.2 or higher, I did everything and even changed the water.

I keep adding 2lbs PH- next day PH drop to 7.8 then the day after go up to above 8.0 or higher.

The hardness is 220ppm, the alkalinity is 100, the chlorine level is correct and controlled.

What is wrong with my pool?



Thanks for the question Adel

Salt water pools are a bit different than regular chlorine pool, especially indoor salt pools. Are you using any Trichchlor pucks or any kind of stabilizer or cyanuric acid (CYA)? If you are using them, keep the CYA between 30 - 50ppm.

Do you have any water features such as slides or waterfalls that are always on? This causes aeration and will burn off the carbon dioxide (CO2) which will cause the pH to rise.

Your pH will rise faster when the alkalinity is higher. Reduce the total alkalinity (TA) to 60 - 80ppm. By lowering the TA and letting pH go up just a little will probably slow or stop the rapid rate of pH increase.

Pool Alkalinity

Total Alkalinity

Add the acid with the pump off and in the deepest part of the pool. Gently sweep the bottom to break up any hot spots of acid. Allow the pool to sit for 4 - 6 hours, then turn the pump back on and allow for 1 full turnover of the water. This is normally about 8 - 10 hours. Retest the TA and make another adjustment if needed.

Hope this helps and let me know how it turns out for you.


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