Richard Brenner, hazardous materials coordinator for the Clark County Fire Department, said that sodium hypochlorite went into the hotel’s lazy river pool when a valve used to control the 
chemical malfunctioned and did not shut off properly. He also added that the chemical went into the water and fumes in the air had made guests sick but expected them all to be ok.
About 100 people had trouble breathing but did not need to go to hospitals, instead were treated by responding emergency personnel. It was also reported that the people taken to local hospitals were conscious and alert and none of the guests were in critical condition.
High concentrations of a chemical similar to bleach seeped into a pool at the world-famous MGM Grand on the Las Vegas Strip, leading the hotel officials to evacuate some 1,500 guests and sending at least 26 people to local hospitals with breathing difficulties on Friday.
“People started smelling chlorine. It doesn’t take much to set our nose offâ€, Brenner said.
The MGM Resorts International officials emphasized that once it was discovered what happened the valve was immediately shut off. While the leak only affected the lazy river pool, all of the resort’s five pools were closed to error on the side of caution.
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