Whne I was in Texas, the Plumbing Association had a trailer fitted with bathroom fixtures, Kitchen fixtures and irrigation fixtures to demonstrate how vacuum could contaminate a distribution system. It was very impressive and wondered if someone in Florida has one that could be used to demonstrate to Water Plant Operators and Distribution crew why backflow preventor is important.
My initial reaction is that it would be a nice audio visual device, but that if the operators, etc. have not learned about them by the time they have gotten their jobs, then they are in the wrong positions. Backflow prevention is so elemental and necessary, that it should be one of the first items a trainee learns. Especially in a water distribution center. And no amount of A/V aids will prevent a worker from installing the proper device improperly, as I once saw in a U.S. Post Office.