Hello all. I did no use the water tank in my pup at all last year as my tow vehicle really could not handle the extra weight. My new tow vehicle can, so I want to use it at least for cooking and cleaning and such. I tried to search the forums but did not have much luck (I could have been using the wrong search terms). I am guessing I would use bleach to clean the fresh water tank, but at what concentration? Also, how does the gray water tank work, and could someone post some pics of one may be? That would be of great help.