Quote:
Originally Posted by edgemar
Could low flow toilets be the issue...since they didn't exist when the plumbing was put in?
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Low-flow toilets should be negligible to showers dishwashers and washing machines I would think.
Quote:
Originally Posted by edgemar
I fairly sure it was within my unit because my wife got something and was running to the toilet A LOT. 
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There are different brands of TP.
-Some are like cloth and will clog anything quick.
-Some dissolve easily and are made for RVs and are rated "septic-field friendly".
My ex used quite a bit, and the house once got a clog/backup as well, perhaps as a result. Whatever.
I still suspect the issue is still downhill though.
As a safety measure you probably can install a 1-way backflow prevention check valve at the exit of your unit.