Muratic Acid & Salt Water Swimming Pool..Lower pH Level

by Teresa
(Mishawaka IN)

Can I use muriatic acid to lower the pH pool level in my saltwater pool? Will it harm my saltwater filter/pump?

Thanks for the question Teresa

Muriatic acid can be used in both salt water pools and regular chlorinated pools to safely lower the pH level.

You can apply them the same way and the acid will have the same affect on both the total alkalinity and the pH level, depending on the application used.

Swimming Pool pH Levels

Swimming Pool Muriatic Acid

Unless the acid is poured directly into the skimmers, it will be a safe way to lower the pH level.

Have a great Summer


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Why Do I Have Low pH Pool Level & No Free Chlorine In My Swimming Pool

by Michelle

We have an in-ground pool 25,000 gallons and have been having difficulty keeping the pH and total alkalinity up.

Of course with these low levels we also are showing no free chlorine.

Tonight I am going to add 5# of alkalinity up.

How soon after that can I add some liquid chlorine, or should I get the pH and alkalinity adjusted correctly before adding chlorine?


I find this site very informative.

Thanks for the question Michelle

The question didn't mention what there readings were for the pH and alkalinity levels, so I can only assume.

First, you can go to these links to learn how to get the pH and total alkalinity in the correct range.

Swimming Pool pH Levels

Swimming Pool Alkalinity

You can start by adding the sodium bicarbonate which will increase both the pH and alkalinity. Once they're both a little higher, decrease the pH by using muriatic acid using the method in the link above.

Then repeat the process again until the pH is between 7.6 - 7.8 and alkalinity if between 80ppm - 100ppm.

Next is to hit the chlorine level.

Adjust Your Swimming Pool Chlorine

You need to get the cyanuric acid level up. This is the stabilizer for your chlorine and should be between 30ppm - 50ppm.

Chlorine Tablets

Get a Taylor Reagent FAS-DPD K-2006 pool water test kit.

Water Testing Kit

After adding any pool chemicals, you'll need to wait for one full turn-over of the water and re-test before making another adjustment.

This is when all the pool water has been filtered and returned back into the pool. Normally it's about 10 - 12 hours.

Have a great Summer


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4 Children Burnt In Swimming Pool..Very Low pH Level

All 4 children have varying degrees of blisters caused by swimming in pool whilst on holiday in private house in Portugal. The swimming pool pH level measured at 3.

Owner struggling to get pH up to 7.

Any suggestions?

Thanks for your question

I would say that getting a pool pH level down to 3 would take an enormous amount of muriatic acid, or some other massive outside source. Fill water is normally around 7.2 here in the states, so I'm not too sure what it is in Portugal.

I would first recommend that the pool owner get a Taylor Reagent FAS-DPD K-2006 pool water test kit. It's the best one on the market.

Pool Water Testing Kit

Next, you can go to this link to learn how to raise the pool pH level quickly and with the least amount of effort:

Swimming Pool pH Levels

You can use either baking soda, sometimes called sodium bicarbonate, or 20 Mule Team Borax to raise the pool pH level and bring it to an acceptable level of 7.6 - 7.8.

If the fill water has an extremely low pH level, I would look into getting the water delivered in.

Hope this helps and I wish the children luck with their blisters


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How Long After Adding Muratic Acid Should I Wait To Recheck The Alkalinity Levels

by Jennifer

I was wondering how long after putting the acid in should I wait to recheck the levels.

I'm trying to lower my alkalinity.

Is there a certain time of day I should check it.

I live in Florida and have an above ground 6000 gallon vinyl pool.

Thanks for the question Jennifer

After adding any chemicals or making adjustments to your pool, you should wait for 1 full turnover of the water.

This is normally about 8 - 10 hours.

Many pool owners make the mistake adding a chemical then testing an hour later.

You always need to wait for a full turnover of the water.

Try to make your adjustments in the evening, then test in the morning.

You can go to these links to learn the best way to lower the alkalinity without much happening to the pH.

Pool Alkalinity

Total Alkalinity

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

Swimming Pool Questions and Answers

Hope this helps and have a fun and safe swimming season.


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Whole Bottle Of pH Plus And Level Won't Increase...pH Problem..

I have put a whole bottle of pH plus and it still has not increased at all. I do not know what to do. It is still in the lowest color.

Do I add more pH plus or does it need more time to run? It has been four hours since I put the pH plus in.

Also, can you add too much at one time? If you can, what does it do?

Thanks for the question

First I would ask:

At what level was the pH?

What is it now?

What range are you trying to get to?

How much pH plus have you put in? Was it a quart, 1/2 gallon, gallon? How big is your pool (how many gallons)?

These really need to be addressed for myself and others who may be having this problem.

Let's say your pH was 6.5 and you're trying to get to 7.6. You have a 50,000 gallon pool and you put in a quart of pH plus, then the pH level probably won't increase very much.

I would need answers to the above questions before I can give you the information you need.

To answer your last question; yes you can put in too much pH plus, or any chemical for that matter.

If you add too much at one time, your pH level will probably go through the roof. You'll then need to use muriatic acid to bring the level back down.

And ALWAYS, regardless of what anyone says, ALWAYS wait for 1 full turnover of the pool water before making any additional adjustments.

After the water has had a chance to fully circulate should you retest. This is normally around 8 - 10 hours, and this is where most people become impatient.

When making chemical adjustments to your pool, it's best to make them in the evening, turn the pump on and allow to circulate all night, then retest.

If you can come back with the above information, I'm sure I can help.


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Comment on Lowering pH Chart

by Bob Lowry
(Lima, Peru)

Your above "Chart - Lowering pH with Muriatic Acid" has the word Increase above the pH column.

What does this mean?

Should that be current level or if your pH is this?

Thanks for the question Bob

The chart means that if your pH level has increased by "X", then you'll need to use "this amount of muriatic acid" to bring it down to the desired level.

An example would be if the pH level went from 7.4 to 8.0, you would need "X" amount to bring it back down to 7.4.

I can understand the confusion. I'll take a look at the chart and make a correction if I receive another question about it.

Thanks for bringing it to my attention and I hope this clears it up for you.

Have a great swimming season


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Home Pool Owner..Fiberglass Pool..Low pH Level..

Since fiberglass lining my pool, the pH level has been too low. I used sodium carbonate but this leaves the water cloudy.

Will sodium bicarbonate work better and if so is it available in tablet form?

What other chemical is available to raise the swimming pool pH level? I thought that bleach would work but I understand it also forms more acid?

Would appreciate any help



Thanks for your question Lou

I'm a big fan of fiberglass swimming pools. They use about 50% less pool chemicals and last for years.

Sodium bicarbonate will help in raising the pool pH level. You can go to this link to learn the best way to do it:

Swimming Pool pH Levels..Chemistry..Alkalinity..Water..Care

The best and easiest way to add it is in the powder form. You'll just need regular baking soda. 20 Mule Team Borax will also do if you can't find enough bicarb.

Bleach is nothing more than watered down liquid swimming pool chlorine (sodium hypochlorite). This is used as a sanitizer, not to adjust the pH level or total alkalinity. That's done using muriatic acid, which you can also find on the link above, and this one:

Swimming Pool Muriatic Acid..Chemistry..Care..pH..Alkalinity

Hope this helps and have a great Summer


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