This loosens the soil and brings the soil suspended in the foam to the top of the carpet pile. The dry foam does not overwet the carpet or the backing and drying times are exceptionally fast. Some cleaners report 20 minutes, depending on humidity. Dirty detergent foam removal must be immediate. Laboratory tests discovered that even a time-lag of 15 seconds is too much between agitation and detergent removal with a system such as wet vac, and then moisture and dirt removal are minimal.
Gravity works quickly and the soil and detergent sink back into the pile.
To be acceptable, carpet cleaning systems and detergents should clean carpets to at least the 75 percent appearance level which is sufficient to provide carpet owner satisfaction. Based on continuous testing and data evaluations, the Von Schrader system continues to be in the forefront of cleaning technology. Fiber and carpet technology will change more and place new demands on the professional carpet cleaner. By the year 2000, carpet technologists expect power and phone communication lines to be woven through the carpet. Fiber optics will be included for home computers.