Swimming Pool Muriatic Acid

Muriatic acid and swimming pool chemistry. No problems lowering levels with inground pool maintenance, salt water pool maintenance and above ground pools.

It is one one of the most corrosive forms of acid and its use goes from swimming pool care to metal and brick cleaning.

If you happen to spill some on your clothes, fabrics, varnished furniture, plastics, or most any painted surface, you can say bye-bye to them because it will eat through these things before you're able to wash it off. 

Great care must be taken to ensure you're safe around this kind of acid.

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Types Of Pool Acid

There are mainly two kinds that you need to be concerned about. They are:

  • Liquid muriatic acid
  • Dry acid or sodium bisulphate

Dry acid is easier to store, handle, and apply but also must be used with care. 

Muriatic Acid Uses & Functions

The two main uses for hydrochloric acid is to lower your pool pH and pool alkalinity levels.

muriatic acid, swimming pool ph, swimming pool care, swimming pool care instructions,tips

The process on how to do that is found in the above links and also in the charts below. 

Safety First

  • Always add your acid to water, never water to acid
  • Always wear heavy-duty gloves, goggles, and long sleeve shirt
  • Keep out of reach of children and pets
  • Store away from other chemicals and never store liquid over dry pool chemicals
  • Please remember that muriatic acid is one of the most powerful and corrosive forms of acid so take the proper precautions. 

Chart - Lowering Swimming Pool Total Alkalinity

Decrease GALLONS IN POOL
(ppm) 1,000 5,000 10,000 15,000 20,000 25,000 50,000
10 2.56 oz. 0.8 pts. 0.8 qts. 1.2 qts. 1.6 qts. 2.0 qts. 1 gal.
20 5.12 oz. 1.60 pts. 1.6 qts. 2.4 qts. 3.2 qts. 1.0 gal. 2 gal.
30 7.68 oz. 1.2 qts. 2.4 qts. 3.6 qts. 1.2 gal. 1.5 gal. 3 gal.
40 10.24 oz. 1.6 qts. 3.2 qts. 1.2 gal. 1.6 gal. 2.0 gal. 4 gal.
50 12.80 oz. 2.0 qts. 1.0 gal. 1.5 gal. 2.0 gal. 2.5 gal. 5 gal.
60 15.36 oz. 2.4 qts. 1.2 gal. 1.8 gal. 2.4 gal. 3.0 gal. 6 gal.
70 1.12 pts. 2.8 qts. 1.4 gal. 2.1 gal. 2.8 gal. 3.5 gal. 7 gal.
80 1.28 pts. 3.2 qts. 1.6 gal. 2.4 gal. 3.2 gal. 4.0 gal. 8 gal.
90 1.44 pts. 3.6 qts. 1.8 gal. 2.7 gal. 3.6 gal. 4.5 gal. 9 gal.
100 1.60 pts. 1.0 gal. 2.0 gal. 3.0 gal. 4.0 gal. 5.0 gal. 10 gal.

Chart- Lowering Swimming Pool pH Level

Decrease GALLONS IN POOL
pH 1,000 5,000 10,000 15,000 20,000 25,000 50,000
7.6-7.8 1 1/2 oz. 6 oz. 12 oz. 18 oz. 24 oz. 1 qt. 2 qts.
7.8-8.0 1 1/2 oz. 8 oz. 16 oz. 24 oz. 1 qt. 1 1/4 qts. 2 1/2 qts.
8.0-8.4 2 1/2 oz. 12 oz. 24 oz. 1 1/4 qts. 1 1/2 qts. 2 qts. 1 gal.
Over 8.4 3 oz. 16 oz. 1 qt. 1 1/4 qts. 2 qts. 2 1/2 qts. 1 1/4 gal.

Once again, be aware that muriatic acid is dangerous so take the proper precautions when making any adjustments to your pool and handle it with care. 

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What Other Visitors Have Said

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Adding muriatic acid Not rated yet
I just repainted my pool one month ago. I am going to need to add muriatic acid because the alkalinity level is very high. Will the acid hurt my paint …

What Type Of Pool Acid To Use-Liquid or Powder Not rated yet
I have an in ground pool with a salt system. I have had trouble maintaining the pH level. What type of acid works best? Normally, muriatic …