I am building a new house, with a "lake well" for water. A submersible pump (Goulds, 10 gpm) on the lake bottom (about 15' under water, with a filter) supplies water to the house, which sits on the top of a 15-20' cliff. My contractor has indicated (as have the neighbors) that, because the pipe (actually, 1" poly hose at the important location) transitions from a vertical to a horizontal orientation at the top of a 15' cliff before going underground, I will need a drain back arrangement to keep the water in the hose from freezing in the winter. Is there such a thing as a "drain back" valve? I think one posting in this forum mentioned such a thing. Also, it seems that if the hose is drained to the water line every time the pump turns off, I will also need some sort of air venting system (unless its in the drain back valve) or there will be a lot of air getting pumped into the water supply system. I was told by one of the neighbors that he implemented this system by simply installing a check valve in reverse, to allow air into the system when the pump stopped, with a regular check valve upstream to keep the water in the house. Does this make sense? Thanks.