Originally Posted by Gerg
Shut off the supply and drain as best you can. Low spots will freeze but there should be enough expansion space to keep from breaking lnes. Flush toilets then use a plunger to push as much water out of the bowl that you can OR use RV antifreeze. It's non toxic and won't hurt your system. Also make sure you pour a little down the sink traps.
I don't think regular antifreeze will hurt your septic system.
+1 open all the faucets too
We're not out here to rough it. We're here to smooth it. Things are rough enough in town.