The product dries very quickly and is ready to put back in service after about 20 minutes. The counter rotating brushes offer excellent agitation. The thicker and more dense the pile of the carpet the more it has a tendency to trap the powder and cause a build up. Even with a powerful vacuum, over a period of time the powder will build up at the base of the carpet. This can cause excess dust in a home or business.
Water is cheap.
When used as a carrier it costs practically nothing. The manufactured product used as the powdered carrying agent along with the chemical, make this method of cleaning quite expensive. When faced with a heavily soiled carpet where the soils and oils have oxidized over time, this method is not an effective cleaning system. The lack of flushing motion and limited application of potent chemical, make this system useful only when used in a consistent maintenance program where the carpets are not allowed to become overly soiled .