If the main concern is misuse of the family pools, a simple and cheap solution would be to require people to check in with the person at the desk in the rec center. They would turn in their ID cards in exchange for a wrist band which would be very easy to check both in and out of the water.
I would think that requiring a visible indication that you are allowed to be there would significantly cut down on those trying to beat the system. Problem solved without the need for more employees or electronic monitors.
edit: George1938 - we think alike
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