Pool Question On Alkalinity

by Brian

I have a pool 14 by 28 feet average depth is 4.5

pool equipment is Pentair variable speed pump, salt water chrolinator and solar touch control, Polaris pool sweeper and a Pentair sand filter.

The pool runs from 8 till 6pm I have attached photos of my readings but my alkalinity readings are around 180 to 200.

Any help will be appreciated.

Thanks for the question Brian

First I would encourage you to use a Taylor K-2006 pool test kit. The one you have is good but the K series is the most accurate.

Your pool is approx. 18k gallons, is that correct? The TA normally doesn't go up on its own, it needs some kind of outside source such as overuse of bicarb, rain, high TA fill water.

To lower the TA 10ppm per 10k gallons its 20 oz. of muriatic acid. The range for the TA is 80 - 100ppm so you need to decrease it by 80ppm. Do this in smaller steps.

The acid will be hitting the pH a bit as well. You have two choices to raise the pH. First is to use 25 oz. per 10k gallons of soda ash or aerate the water using an air compressor. What's happening is you're decreasing both the TA and pH then raising the pH back again but the TA will remain down. You'll probably need about 1/2 - 3/4 gallon of acid so start small and work your way down. You may need to do this 3 - 4 times to hit the 80 - 100ppm TA mark.

It also seems the FC is a bit high as well. The range for FC is 2 - 4ppm. You may want that to come down to the proper range.

I hope this has answered your question to your satisfaction.


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Total Alkalinity Too High

by Larry
(Orlando, Florida)

I put too much total alkalinity in my 13000 above ground pool. It turned the water Milky. How much Muratic acid should I add?

Hi Larry

It all depends upon the current TA reading. You can use 15 oz. of acid to reduce the TA 10ppm per 10k gallons. You're not too far off from 10k so I'd start there.

If your current TA reading is 150ppm and your goal is 100ppm you can start with about 45 oz of acid then move from there. Retest after 8 hours of filtering and make another adjustment if needed.


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