I just purchased the Big Green Machine to clean my 25 year old carpet through out much of my home. I was seriously thinking about replacing this carpet because it had several pet stains. I had a professional carpet company come out to stretch my carpet the installer said my carpet was the best made carpet available with burlap backing. He suggested that i have it professionally cleaned before replacing it. With much thought and investigating I decided to try to save money hiring a professional and purchase the Big Green Machine. To make a long story short. I am thrilled with the results my carpet looks brand new.