Around water it is best to shed any electronic equipment. A little zap may not kill you but it may just end the life of your favorite electronic device. Ours being the kids Cochlear Implants.
It was always a big concern to let our kids swim without the ability to hear. But in all reality my hearing kids are under water most of the time and can't hear me anyway.
It has come down to this...we just need to make our kids excellent swimmers. The earlier the better. At least for now it eases some of the anxiety.
Lucky for us, grandma loves to have them in her swim class.