Is is safe to swim with high Alkalinity??

Problems relating to pH and total alkalinity.
Increase ph, increase TA. Reduce pH, reduce TA.
pH chemistry advice and techniques for the pool.
Cari

Is is safe to swim with high Alkalinity??

Postby Cari » Tue 03 Jul, 2007 19:15

We are brand new pool owners. Our gunite/plastered pool was just completed and filled on Saturday (6/30) and equipment start-up was on Monday (7/2). The chlorine and ph levels are great, but the alkaline is very high, which I believe is to be expected since it is newly filled & the plaster is curing. When I tested the TA, I stopped adding drops after 26, so the TA level is 260+. I have 2 questions...

1) At this early date of pool startup, do we need to begin taking the steps I've seen recommended on this site to bring up ph, then bring down both ph and ta? Or do we need to wait it out a bit before adding extra chemicals?

2) With the 4th of July tomorrow, we were hoping to swim with family. Is it okay to swim with such high TA levels? I am 8 months pregnant and also have a 5 and 3 year old. We are anxious to swim, but obviously not at any health risk!!!

I would appreciate any replies. I hope everyone has a great 4th of July!!!!!!!

Cari


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Postby chem geek » Tue 03 Jul, 2007 20:04

So long as you have sufficient chlorine in the pool and the pH is between 7.0 and 8.0 (7.5 is best), then the high Total Alkalinity (TA) is no problem for swimming. The main problem with the high TA is that if the Calcium Hardness (CH) is also high then you can get cloudiness or scaling. Over time, your pool will tend to rise in pH unless you use an acidic source of chlorine (such as Trichlor, but that increases Cyanuric Acid levels).
benson

Is is safe to swim with high Alkalinity??

Postby benson » Thu 13 Jun, 2013 13:58

The ta 240
cya are 30-50
ph is 7.5-7.8

is it ok to swim in it?
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Is is safe to swim with high Alkalinity??

Postby chem geek » Fri 14 Jun, 2013 01:26

Again, the safety has to do with whether you have a disinfectant in the water and you did not list any disinfectant level such as Free Chlorine (FC). A high TA is not a problem unless the Calcium Hardness (CH) is also high in which case you can risk getting calcium carbonate scale -- not a health hazard, but not good for pool surfaces (including gas heat exchangers).
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Re: Is is safe to swim with high Alkalinity??

Postby Poonamdpi » Wed 09 Aug, 2017 02:01

Hello,
No, it is not safe to swim with high alkalinity. The high alkalinity can cause problems with you as well as the pool. A pH above 7.8 can cause cloudiness in the water and scale along the sides of your pool.
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Re: Is is safe to swim with high Alkalinity??

Postby Denniswiseman » Wed 09 Aug, 2017 03:18

Poonamdpi wrote:Hello,
No, it is not safe to swim with high alkalinity. The high alkalinity can cause problems with you as well as the pool. A pH above 7.8 can cause cloudiness in the water and scale along the sides of your pool.

Yes it is safe to swim, however high TA will cause your pH to rise which isn't desirable, lower pH under 7 is more of a problem as it's acidic
To Lower TA
Raise pH to a higher level by aeration
Use muriatic acid to lower it to 7.2 using Pool Maths
This will lower TA as well
Repeat the process untill your TA is at a better level
Use these common chemicals to maintain your pool
Liquid chlorine (sodium hypochlorite or plain bleach)
Muriatic acid (hydrochloric acid) to lower pH and TA
Bicarbonate of soda to raise TA
Aeration will raise pH only
Soda ash will raise pH and TA
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Re: Is is safe to swim with high Alkalinity??

Postby Poolcovers » Mon 19 Feb, 2018 03:01

Yes, it is safe for swimming. Total Alkalinity is the sum of all the alkaline chemicals in your pool. The TA levels can impact the pH if the levels are too low. The standard and optimum pH for pool water is 7.4, since this is the same as the pH in human eyes and mucous membranes. A pH of 7.4 also gives good chlorine disinfection. Remember, adjusting the TA levels can affect your pH levels as well, so be careful when adjusting these levels as you may have to readjust your pH levels when you are finished. It is very important that total alkalinity should be maintained in the range of 80 to 150 ppm. If it violates, then it acts as per below:
If total alkalinity is too low:
pH changes rapidly when chemicals or impurities enter the water. pH may drop rapidly, causing etching and corrosion.
If total alkalinity is too high:
pH becomes difficult to adjust. High pH often occurs causing other problems such as; cloudy water, decreased disinfectant effectiveness, scale formation and filter problems.
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Re: Is is safe to swim with high Alkalinity??

Postby Teapot » Mon 19 Feb, 2018 05:06

The original poster had a new pool, it is wise to start a new concrete, plaster tile pool on a higher level of alkalinity to allow the pool surface to cure quicker. This alkalinity level can then be reduced.
If the pool is vinyl liner or glass fibre the alkalinity can be much lower 40-60ppm providing the pH remains stable. Using very acidic pool pucks will lower pH and alkalinity over time. Using bleach (Chlorox etc) allows a lower alkalinity to be used but even at 40ppm there is still around 7 times more carbonates in the water than the air so the off gassing of CO2 (the cause of pH rise) will be much slower than with an alkalinity of 80 to 150 ppm. The amount of acid (pH-) required to correct any pH rise will be considerably less so some of the old guide tables only based on concrete, plaster, tiled pools which need to run a higher alkalinity can confuse the issue, although running a higher pH could also reduce any aggressive water issues.
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Re: Is is safe to swim with high Alkalinity??

Postby swimlikearock » Tue 06 Mar, 2018 11:29

Should be fine to swim with high Alkalinity. Just keep an eye on your chemicals levels and test often.
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