Not with little kids in there. About 30 years ago I took my kids to our sub-division pool. I'll never forget (we still laugh about it today) the teen age life guard went code-3 with his whistle after someone spotted a kiddie floater. People started screaming and swimming like mad to get out. It reminded me of the scene in "Jaws: Major pool evac and closure until they removed the offending matter and did a major rechemical. You can't make this stuff up. Still a good memory.
Excellent! I forgot about that. Went back and looked at u-tube. Yup it was like that (they stole our script). Only difference the constant whistle sound and of course in our case it was the real McCoy (a smaller rounder verison).