Hello, new to the forum. I'm currently at a client's home doing general repairs. I don't know much about pools but I would like to help them with some concerns they have as they think there's a leak in their infinity pool. Specifically in the catch basin. Some days the water level in the catch basin is low, other days higher and overflows out of the leveler tank. When the pumps are on, the water in the catch basin goes down several inches, when they turn off, the water in the catch basin goes up slowly through the day until it overfills the overflow tank. Is it normal for water in the catch basin to continue to rise after the pump shuts off? The check valves look closed at the pumps. Thanks for any help and ideas.