The main safety consideration, as far as kids and pools are concerned,
is to have little enough water in the pool so that the smallest kid
can safely be in the pool, and high enough walls so that small kids
cannot climb there by themselves. I would suppose that some kids are not
able to follow rules, but in our house they know not to go there
without supervision until they are fully able to safely play in the
pool. It is better to err on the safe side.

i