How Long After Adding Muriatic Acid Can You Swim?

According to E. Trasolini Pool Construction Ltd. "Owners Manual and Maintenance Guide," you should wait at least 15 minutes before swimming in a pool which has been treated with muriatic acid.

Girl (8-9) swimming underwater, showing thumbs up, underwater view
credit: Ryan McVay/Photodisc/Getty Images
Muriatic acid is used to restore pH balance in swimming pools.

Wait 15 Minutes

Boy floating in swimming pool
credit: Jupiterimages/liquidlibrary/Getty Images
E. Trasolini Pool Construction Ltd. suggests waiting 15 minutes before swimming.

Wait Two Hours

Girl swimming underwater
credit: Comstock/Stockbyte/Getty Images
Clean Pool and Spa suggests waiting two hours before swimming.

According to Clean Pool and Spa, you should wait no less than two hours before swimming in a pool which has been treated with muriatic acid. According to the website, "If you pour muriatic acid in the pool and swim within 10 to 15 minutes you might get a 'hot spot' of acid that can burn you."

Bottom Line

Parents teaching daughter how to swim
credit: Pixland/Pixland/Getty Images
Make sure that the chemical has dispersed throughout the pool before swimming.

Muriatic acids can contain hydrochloric acid concentration levels between 28 and 35 percent. According to, "Hydrochloric acid is highly corrosive and irritating to the eyes and respiratory tract. Acute inhalation exposure may cause coughing, hoarseness, inflammation, and ulceration of the respiratory tract." As with most pool treatment chemicals, it is advisable that you wait two hours after using this product before swimming.