One common chemical that is often used to help lower a pool's pH is muriatic acid, a diluted form of hydrochloric acid. It's a strong acid that can quickly lower pH levels in pool water ...

A worker was hospitalized after a container of muriatic acid was improperly discarded with household trash, releasing ...

a diluted form of hydrochloric acid commonly used for pool maintenance. When the trash truck compacted the garbage, the liquid turned to gas and sent up a plume that onlookers confused for smoke.