I think so, too. The first outlet needs 3/5 water for the whole spraying process, and the two outlets drain water together. Each water outlet only uses 2.5/5 water of the water tank, that is,12 water, and the whole cleaning process is short of 0.5/5 water, that is, 0.5 part of water is used for cleaning 100 meter, and there are 6 parts in 3, so the whole cleaning process is 6 * 60.