We just completed cleaning a building floor (30,000 sq.ft.). Used both trucks, 3 men, two surface cleaners, and then a wand sweep & rinse. Working time was about 5 hours. Did part of the walls also. Each unit was running hot 8 gpm or more.
We did a 100,000 sq.ft. building several months ago. Had to pick up all of the water. Rented a Tennent scrubber to pick up the water. Used wands for most of it. Both trucks, 4 men, 4 days. Estimate that we used well over 12,000 gallons of water!
Dave Olson