Berkeley High School (in Berkeley, CA) had to close its pool when parents alerted them, saying that their children were complaining of burning eyes, bleached hair, and loss of body hair!!!!!! That's what a pH of 8.5 can do.
City closes school pool after kids show serious symptoms
The article explains how it happened. My question is, how long did it go on? Were they not testing on a daily basis? (A semi-public pool requires testing of chlorine and pH at least once per day.)