We cannot get anywhere near our septic, so we purchased a "muncher-cruncher-pump" (I know, gross) at camping world. It hooks right on to the 3" outlet on the rv (needs elec), turned it on and were actually able to pump uphill thru a garden hose into a cleanout pipe that connects to the septic tank. I drilled a hole for the hose in the 4" cap of the cleanout and found a fitted plug to plug it when not in use... We just run some fresh water into the holding tanks at the end as usual. Works fine and very clean.