I used a 50' commercial 1" hose. (Home Depot) Connected that to a 20' length of 2" PVC that ran along my deck and into my basement to a cleanout. Sounds like more of a Rube Goldberg than it really was.
You will need a lot of water to help things along and flush the hose. My pump was 12v dc made for RV use and worked great.( Flojet) If your pump has decent lift it should work. Good luck, Hank
That hose was dedicated to that task ONLY.
"Oh black water, keep on rolln', keep on rolln' ............"
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Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD
.. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite