Drying is a process of evaporation. Thus, the less water left in the carpet the quicker it dries. An extractor that removes close to 100% of the water it uses in cleaning will allow the area to be reoccupied sooner. Faster drying also keeps mold, mildew and their resulting odors and potential allergen effects from forming. In a nutshell, the quicker the carpet dries, the sooner activity can be resumed and the better the indoor air quality will be.