Its important for parents to have their kids who are in diapers to wear the swim diapers. So, if you see a toddler who isn't wearing a swim diaper, might want to mention it to the lifegueard.
At our pool, the pool manager is always on the deck, and as a kid walks in, looks carefully at the little ones who may be of diaper age. And she will confirm with the parents that they are wearing a swim diaper, and if they don't have one on, they can purchase them.
It really cuts down on accidents, and helps keep the pool open more because if all the kids are wearing them less accidents.
You always want the pool to close if there is an accident because otherwise you could get sick from the contamination. YUCK who wants to get sick from swimming in a pool.