My dad's friend has a very big pond. He has some chinese koi and stuff in there and we live in Michigan. He has a really neat idea for a bubbler too. He has a windmill on the side of his pond and that powers the bubbler. He always at least has a small hole in the middle of the pond where the bubbles are. And I thought about it and you could always put the filter part inside and just make a huge coil so the water stays inside as long as possible before flowing back outside. That would be a nice free heating idea since your heating your house anyways. You could like go into a basement or something like that.
Chad
Chad
