MW Man wrote:

Prompt expert's advise is greatly appreciatted, as things are starting
to s(t)ink here!.

MWMAN

you don't need an expert to tell you, your smelling your own feces, its
metane gas and it's highly explosive

if you send a charge down the sink drain, it could blow the whole
****ing septic system

by the way.. which way does the water spin as you flush the toilet?