I'm a bit rusty on this and need my thinking double checked.

I need to drain liquid from a reservoir maybe 1' above the disposal point,
through a flex hose, to the disposal point. It's possible there may have to
be a sag in the hose below the disposal connection point, but coming back up
to it. It would end up being something like the p trap under sink things we
use.

My question is: will the liquid get drained this way? I think it will (all
except for the portion in the sag). Just checking my thinking.