Dry Acid vs. Muriatic Acid

Dry Acid vs. Muriatic Acid: Everything You Need To Know

Adjusting your pool’s pH is critical to ensure that your facility remains clean. Chlorine works effectively when the pH is low, but extremely low pH can result in irritation and ruin the equipment. 

If you want to adjust the pH, there are a few products you can use, such as dry acid, muriatic acid, or C02. This article looks at dry acid vs. muriatic acid to highlight the things you should know.

What is Dry Acid?

Dry acid is also referred to as sodium bisulfate. It is safer to use compared to muriatic acid and is found in granular forms. 

Also, dry acid for pools is more expensive compared to muriatic acid. However, the ease of use and the safety it brings is worth the extra dollars.

When you visit a pool store, you should ask for pH minus or pH down – its common names.

What is Muriatic Acid?

Muriatic acid is readily available in pool stores and hardware outlets, and its common name is Hydrochloric acid. Previously, it was known as “spirits of salt” since it comes from salts.

However, if want it for your swimming pool, it goes by the name of muriatic acid. It is cheaper when you get it from your local hardware, but it comes in various concentrations.

Pool stores sell a high concentration of this product (30%) while the hardware stores sell a level of about 15%. 

How to Add Dry Acid

How can you use pH minus in your pool? 

  • You can use this acid to reduce the TA and pH in your spa and pools. It is easier and safer to use than muriatic acid. The required amount of pH should be between 7.0-7.6 while the TA should be between 80-120 ppm.
  • Pre-dissolve the acid in the water inside a plastic bucket and then add the solution to the deepest part of your facility. Avoid adding it near the fixture or skimmer. Add it when the pool’s pump is operating and leave it to circulate for about four hours. 
  • Don’t add over 150g of sodium bisulfate per 10K liters of water at a go. Also, do not add it more than 3x per day.

How to Add Muriatic Acid

You can pour muriatic acid straight into the pool if you are in a hurry, but it is easier to handle if you dilute it first. Besides, it becomes less dangerous if it splashes around.

The right ratio of this acid to water should be 10:1. Thus, add the right amount of acid into a bucket and then stir it with a wooden or plastic stick. 

Now you can pour the solution to the pool.

A Side Note: Always add acid to the water, not water to the acid. 

Dry Acid vs. Muriatic Acid: Which One to Use?

You can either use dry acid or muriatic acid to lower the pH of your swimming pool and the alkalinity level. However, some people use dry acid because it is easier to add to the pool and is less corrosive – it won’t damage pool surfaces or burn them in case it is spilled accidentally. 

It is also straightforward to store dry acid, although you need to handle it with care.

Final Thoughts

Whether you choose to use dry acid or muriatic acid, you can rest assured that the products will work. Choose the one that meets your needs in terms of budget.