I don't remember that in school - but I remember it at the public swimming pool we used to go to. It was like a shallow paddling trough that stank of bleach.I remember back in the early 60's when I was in high school phys ed classes that we were supposed to step into the big tray of clorox water before going into the shower after our class time of physical activity. I guess that was to keep our feet from getting smelly fungi disorders...