Any idea how this can happen/what would cause this?
From the article ‘The operator said the rare but very serious occurrence can happen as the result of a pump malfunction, leaving victims to breathe in the toxic gas produced from the mix.’
From the article ‘The operator said the rare but very serious occurrence can happen as the result of a pump malfunction, leaving victims to breathe in the toxic gas produced from the mix.’

Chesterfield pool turned hazmat zone sends 16 to the hospital
Chesterfield Fire and EMS crews responded to a call around 11: 20 a.m. Wednesday, June 15 saying there was a weird smell coming from the 8600 block of Pullman Lane – the location of Harpers M…
www.wric.com