Stupid question: You're going to recover tha water because you have to do it or because you want to do it? Second question: 4200 gallons of water for 26 pieces? That seems like a lot of water. Although I haven't washed a vacuum truck I am familiar with their size, and I have washed a lot of garbage trucks, so I'm going to guess that it would take a similar amount of water to clean them. I don't know if I would even use a third of that amount of water to do a A-1 job. Am I missing something?