Want to set up a new rig and need some help. I would like to know how to setup the  mixing side of it. Do you guys use 3 tanks or 2? As in do you use an SH tank and water tank and have a way of mixing before it gets to the hose reel or do you have a mixing tank as well. How do you set the amount of chem that goes in? Do you have to watch it or have you some way to preset it?

Thanks guys

Michael