Hello, I have a cottage next to Lake Huron in Ontario located on solid limestone. I recently had an 80 ft well dug with flow in excess of 20 gpm. Problem is, that on solid limestone it is not practical to dig down below the frost line. Has anyone had this problem? It is a seasonal cottage and is only used for about 4 months during the summer, not insulated, so all the water lines are drained. Is there a system designed where water can be drained back down to the water level in the well, some kind of relief system that would allow drainback when valves are opened and the pump shut off? The cabin is slightly downhill from the well, so draining those lines would be easy, just need to lower the water from the pitless adapter down to the water level in the well. In the spring, would that valve automatically seal under pressure? Wondering if such a thing exists. Any comments certainly appreciated. Thanks.