I have no idea, this is just a thought...
Would a concentrated solution of salt water or diluted icemelt help thaw the inside of a pipe? Sort of melting as it seeps along the blockage.
BUT would either of these chemicals now do damage in the septic system?
Is there a way to install a commercial grade drain cleaning snake down that pipe and see if it comes back with ice on it? I'm guessing the two business would have tried that first if it was possible. who knows.....
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