Plenty of adults in the water at the same time as kids. Adults are shooting basketballs, chatting, drinking, going off the dive, doing laps...
We have one lap lane. If someone isn't doing laps then people can play in it. They clear it if someone wants to do laps. You can reserve the lap lane online.
There is a break at quarter to the hour, every hour. Anyone under 16 has to get out of the pool for 15 minutes.