Peg- i have gone thru your book and have gotten to the point that I probably have to replace the hoses on my head (s). Being a penny pinching fool I was wondering if the logic of only replacing the hose from the head to the holding tank with odor penertrating resistant hose and using regular sanitaty hose for the pump out section is sound. Following your theory that the hose is perminated when the debris is left unpumped from the head to the holding tank i was hoping to get away without the high priced hose for the rest- any thoughts?