This method is often referred to as warm water extraction, hot water extraction, or steam cleaning. The word "steam" may lead one to believe that very hot, possibly boiling water is employed. Although temperatures vary with equipment, seldom does the temperature reach the boiling point. A water solution under pressure is injected deep into the carpet pile and then immediately vacuumed out into a holding tank along with the soil. This method flushes residual matter reducing the risk of re-soiling.