Tim, I think renting a large pump, and fueling it, would cost more than the extra Hydrated Lime needed to nuke it, full.
To create a siphon, your outlet will need to be at minimum, 4' below the inlet point and 100% air-tight. 4" Sewer and drain pipe are pretty cheap, and would work great for the downhill side, but you'll need schedule 40 for the lift and crossover sections because the vacuum will suck a S&D pipe flat at about 14' of lift.
My chemical spray barge would be for that job....Here is a pic spraying Hydrated lime early this winter,,,
