well started building my rig today. Using work to build it as I am not a welder nor do I have the money to buy my own. Im currently going with a gravity system with plans in the future for a pump or two to make moving water to the HLT easier than manual labor. How do you go about cleaning the pumps is my one question is it the same as just running PBW through the lines to clear them or is there more to it? Ill post pics later.