Rad, one of the considerations is the lifting ability and efficiency of pumps. All things considered equal (hp, size) a pump can push water much higher than it can lift. I know people who have extremely deep, 400 to 500 ft., water wells. It would take a huge pump to lift water that high. However, being submersed, it can very efficiently push it to the surface and have a long life.

It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa