Originally Posted by Minnewaska
I may consider coupling in an ABS pipe for just this part of the run, or come up with a bracket of some kind.
Minnie, coupling it in may leave a narrowing (barb fitting) that again results in waste sitting there. Instead, check the OD of your existing line, and then check the ID of the next larger ABS pipe (probably 2" ??). I think it's big enough to use as an external support. Rip the length of pipe - a band saw would be best, but a table saw would do almost as well. Clamshell the ripped halves over the sagging length of hose with a couple or three clamps.