Too Much Acid In Swimming Pool

by Rudi
(Greenfield WI)

Last year I almost exclusivly chlorinated my pool via auto chlorinator and very seldom shocked because out of whack the chlorine levels were there.


Was now told that my pool water is now out of range and that I have to drain it and or add chemicals or a combo of both. I have an inground pool.




Thanks for the question Rudi

Without the exact chemical numbers it's difficult to determine what "out of whack" and "out of range" mean but I would say that if chlorine tabs were used as the sole chlorine source the CYA/stabilizer is very high, probably above 100ppm. Normal range is 30 - 50ppm.

There are two ways to reduce the CYA. First is a type of reverse osmosis where water is drawn through a hose, filtered, and returned back to the pool. The 2nd is a partial to full drain and refill. There's no chemical to reduce the CYA.

If we use simple math and your CYA is at 120ppm you can drain 3/4. This would remove 90ppm and leave 1/4 water in the pool which would have the remaining 30ppm of CYA. Filter for 10 hours after the new refill, retest all the chemicals and make the right adjustments.

I hope this has answered your question to your satisfaction.

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

Check back to this post for updates or answers.

If you feel your situation is more complex and want immediate assistance (within 24 hrs) you can make a donation of your choice and I'll answer your questions by phone.

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Robert

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Pool Water Change...

by Ron
(Phx, AZ.)

I live in AZ. and I am being told I need to empty my pool and change my water. They are saying the CYA is too high (200) and the Hardness is too high (750).

Is this really the case or can I just add some chemicals?




Thanks for the question Ron

Your CYA needs to be in the range of 30 - 50ppm and hardness, ideally, is 150 - 250ppm. There's no chemical to reduce the CYA or hardness.

It sounds like the pool store employee is correct in saying that a complete water change is needed.

I had a pool route in the Mesa area for years and I know how hard the water is. It will be constant struggle to keep the hardness in line but that's the chance you take when filling your pool with already hard water.

Once you do a complete water change it will be necessary to get the CYA back in line. This can be accomplished by using Dichlor chlorine. This is a stabilized form of chlorine. Once you reach the 30ppm mark, stop with Dichlor and go back to regular liquid chlorine. try to hit the 30ppm mark as best you can. You'll be using Trichlor tabs and that already has CYA in it.

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.

It's 1 1/3 lbs. of Dichlor per 10,000 gallons of water to raise the chlorine 10ppm and add 9ppm CYA.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Cyanuric Acid (CYA)" category.

Check back to this post for updates or answers.

If you need immediate assistance (within 24 hrs) or for emergency personal assistance, you can make a donation of your choice and I'll answer your questions by phone.

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Hope this helps.

Robert

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