We need bigger waste tanks! I am having to pump out every day now with my hi-flow CDS, I tried to see exactly how long I could clean. Saturday was 850 ft and a sofa/ls with the drimaster. How about doubling the width of the waste tank for 220 useable gallons, then setting up a saddle tank system, much like Sweeny's for ~ gallons of fresh. My next TM will have a larger tank, HM or not...