I use a "Y" valve that you use on a garden hose, my chem hose is a garden hose! My ground person can flip a valve in my valve to change my one hose from chem to rinse water! I use the home owners water hose and hook it into my van which has afew manifolds that can fill my tank, feed water into my cold water machine, be my rinse hose, and provide water to my ground guy! The ground guy gets his own hose!