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We have a below grade toilet, and a septic system.
When the rugrats were smaller there was a few occasions when wipes were flushed.
The problem with below grade toilets is that as a low point they preferentially fill if there’s a blockage to the main line, and then they try to pump stuff back u to same.. When it’s blocked this pressurizes the system.
Pulling the inspection cover in the U to snake - and after the first $500 bill to do this, I bought a powered snake - is really really unpleasant.
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