Have what I'm sure will seem like a strange question but it is important so if someone could help I would appreciate it. Have a son who is developmentally disabled and he has a thing for water hoses in pools or hot tubs. A picture of him is attached.

So the hose is fine sometimes but in winter it doesn't work and it also causes problems in other seasons I won't go into. My question is whether it would be safe to use a battery powered submersible pump to operate a hose and pump the water in the tub or pool?

My reasoning is that it recycles the water rather than wastes it and it will make for more comfortable experience as well. Obviously I would not do it if it is dangerous so I know I won't use an electrical pump as there is a one in a million chance something could go wrong. 

So electric is out but I can't say I've ever heard of someone being electrocuted by a battery. Would a battery powered submersible pump be safe?
 [![Picture of Son in Hot Tub With Hose](https://i.stack.imgur.com/phXMg.jpg)](https://i.stack.imgur.com/phXMg.jpg)