If your bathtub is full of freezing, stagnant water, act quickly to melt the internal ice blockage before the expanding ice cracks your PVC or copper plumbing pipes. Use these safe, field-tested methods to restore your drainage:
This expansion narrows the diameter of the pipe. Initially, the tub drains slowly. Eventually, the ice forms a solid "ice clog," creating a dam. The water in your tub has nowhere to go. bathtub won't drain cold weather