[big mike]

One item that seemed to be missed here, is that he mentions a 30" vacuum surface cleaner. I can run my Big Guy way faster than my Mosmatic vacuum unit. The suction slows you down, as does the limited length of vacuum hose. Your money ahead if you're doing a large area (such as a ramp) if you set up your recovery equipment at the drain, rather than trying to vacuum it up with a surface cleaner. We only use the vacuum surfacer for smaller areas, and in poor drainage areas.