Using gray water in garden...

I am moving my washer/dryer to a new location in the house and want to drain the water into a barrel so I can use the gray water in my garden. I know that I need to use cleaners that will not harm the plants but what I don't know is how to prevent the stored water from freezing in the winter. What are my options? Any advice? The water doesn't have to be stored for the winter but it seems that where ever it drains to it would freeze. I live in middle Tennessee so our winters aren't horrible. We do get several good freezes each winter tho.
  3 answers
Your comment...