OMG, why mess with something that is a potential leak in such a NICE pool? Put the kids in life jackets, swim vests or whatever and provide good supervision. Don't risk it - JMHO. Mine learned to swim in a 48" deep pool from the time they were tiny - but if he is so concerned about water depth, add a small "kiddie" pool adjacent to the big pool that can be removed or whatever when they are done with it - I reckon that won't be long.....