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Jul 09, 2015
How do I keep the ph level from rising in the pool
by: Wayne

I work on a pool at a campground with an indoor pool. The capacity is approx 45000 gallons. Up until this year I have never had a ph problem was always about 7.6. This year for some reason the ph will not stay stable. I have to add about 1 gallon of acid every 7 to 10 days. The owner is very frustrated and thinks it is my testing. I use a taylor drop type kit for testing. The alkalinity of the pool is about 140 to 150. The computer test at the pool store does not usually match my readings.

I think I am very careful with the readings and use 5 drops of phenol red to test ph.There is a small leak in the pool as it is older and I replace about 150 to 200 gallons of water per day. Pool repair is not an option in this case.(owner) I am about ready to throw in the towel and tell him to get someone else to do the pool work. Any help would be appeciated.

Thanks for the question Wayne. We can talk about some of the reasons why pH can go up and troubleshoot from there. First is splashing around. This releases CO2 from the water and causes the pH to rise. That's a Law of Physics/Chemistry so you really can't do too much with that. Next is the use or over-use of sodium bicarb (baking soda/TA Up) and/or sodium carbonate (pH Up). Then there's the fill water, either from a well or city. If you're trying to keep the pH at 7.4 - 7.6 but the fill water is 8.2 it will slowly increase. If you're losing about 200 gallons per day that would equate to about 7% loss of water from 45k gallons. The TA range is 80 - 120ppm. Try to get that down as low as you can and the pH may stabilize.

And last would be using calcium hypochlorite for weekly chlorination and super chlorination. Cal hypo has a pH of 12. If you're using any kind of granular chlorine I'd advise you to immediately stop and switch to liquid chlorine.

Check these out and see if any apply to your situation, or perhaps a combination of them.

If you feel your situation is more complex than this, I do phone and/or SKYPE consultations. It makes things go much faster and many people have found it extremely beneficial, saving them time and money in the long run. All your questions will be answered. I have nothing to sell you so you know I'm not bias. If you purchase a personal phone consult you'll get all 3 eBooks for free.

Pool Consultation

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How To Clear Up A Green Pool eBook

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Hope this helps and have a great Summer.


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