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Some people call them water waddles
because people has jumped off and died
Rice with water!
Could be anything... you're to vague in your question
Maybe a little kid pooped a them or it is so people can see them
You can call them sun beds or a pool lounge
No
They called it the Artisian Well
Call a reputable pool builder in your area and ask if a technician can come out and do a "pool school" for you.
shocks electrically?
Call a plumber
They call it the reflecting pool.