FWIW, I keep my pond topped off with a dedicated well...about 250' deep with a 5hp sub. pump, puts out about 50gpm.

No problems that I'm aware of because of it. I know well water is very low in oxygen, but I aerate, so I guess that takes care of it.

The only question I would have is wouldn't putting in an electric pump in a windmill driven well kind of defeat the purpose?

Tom Parker