This is my first year with a pool. I live in Milton Ontario Canada. Just outside of Toronto. At closing my pool company filled up my pool to almost normal summer level. They did this because my yard does not drain water well and my sump pit keeps on getting allot of water. They said this would help the liner not float. I just checked today and the water level in the pool is 4 or 5 inches from the cooping stone. Should I lower the level before the deep freeze comes? Or is the 4 or 5 inches enough space?