Our pool has always been like that. Every hour the kids get out of the pool so the lifeguards can take a break. the adults, over 18 are the only ones that can swim without a lifeguard on duty.
Breaks- Same at "my' Pool. 10 minute break every hour unless it's over 90 degrees then it's a 15 min break. Over 18 Swims at your own risk. - Kid free.
I love kid free swim time. I send them to the concession stand and let my favorite pool manager deal with them! : )
You might want to check out the Clayton Community Pool. It is located just a few blocks from downtown Clayton. The membership start up fee is about 475.00 and goes down to 275.00 after the first year. It is never as crowded as Lionsgate, but it is not as new. There is a break every hour for adult swim. The pool also has a diving board and slide.