I have a 1,100 gallon Norwesco poly tank used as a cistern in the basement of my cabin. This cabin will only be used periodically throughout the winter. This location will get below freezing in winter. If I fill the tank approximately 1/2 full, and the water was to freeze, would the tank be in danger of rupturing/splitting or does the water simply expand upwards without any harm to the tank ? ? ?
Thanks for sharing any experiences with these tanks.