May 8, 2014 – The photo was connected to the St. Augustine Movement, named for the town in . One swimmer, who knew that the ratio of acid to pool water was so great that . Muriatic acid is undiluted hydrochloric acid and is used in the . Jun 13, 2014 – They were taken to jail — after the hotel owner poured acid into the . 1964, black and white protesters jumped into the whites-only pool at the . Aug 16, 2017 – A guide to understanding pH and the effects of unbalanced pH levels in swimming pool water. Aug 18, 2010 – One of the most common pool chemicals is hydrocholoric acid, often known as muriatic acid. It is a very strong acid used to lower the pH or total . Photo: Library of Congress, U.S. News & World Report Magazine Photograph Collection . And though the ratio of pool water to muriatic acid made the chemical . Mar 31, 2017 – It isn’t only chlorine that would help swimming pools, but muriatic acid as well. But what is muriatic acid and what can it do for your pool? Before putting muriatic acid to work in your next home restoration or maintenance project, make sure you follow these safety . Photo: istockphoto.com. Muriatic If the pool’s pH level is too high, muriatic acid can bring balance to the water. Once your pool is completely empty, start the acid-wash process. It will also neutralize the smell of the muriatic acid and reduce etching cause by muriatic acid .