just purchased the wilks RX550i jet wash , first impression was a very well produced product , obviously huge amounts of money and time R&D this product ...... shame they didn't spend a couple of pounds on a manual that was in the least informative , what you would expect ??? ...NO !, complete waste of time , should have left me to just guess what goes with what etc , as for informing one on the how to use the cleaning solution unit ....not a single word on it !!!!! I have to say , who the hell at Wilks ,thought that their manual was informative and well produced , really needs to sit up and smell the coffee !!!! you really need to take stock of your marketing ability .