Whether it is being used for interim or restorative cleaning, the Cascade (400 p.s.i) 25 gallon unit tops the industry in productivity. Cascade will clean a 4,200 square foot area in restorative (deep cleaning) mode in one hour. The competition? Two and a half hours or more. Cascade has one of the fastest dry times in the industry. Carpets are healthy and dry in half the time of a conventional extractor, which means your space is ready for immediate use.