[MaxwellD]

Equally important, if not more so, is the potential for the sewer line to freeze up in an ice ball - particularly if the sewer line is NOT routed straight into the sewer. If it is configured to make a “p-trap” before connecting to sewer, you will experience a backup of water from the sewer line into the shower basin. Usually this results in a cracked sewer line so off to Wal Mart you will be.