Check the water out before allowing the kids permission to enter.

Little kids don't always think before they act. A responsible person should always survey the sub-surface condition of the intended swimming location. Even if you use the same swimming location over and over again, always re-check the situation. Maintain control of the situation, and you will automatically be taking responsible steps to protect your charge. My Dad likes the full face snorkel mask more than I do. For the purpose of the film, I used the snorkel to demonstrate what a responsible person would normally do to protect children. Adult usually have a preference for the full face mask.