You may get relief by using a closet auger. These (get the Ridgid one for
about $25, much better than the cheepy one for $8) help clear the drain. I
use one on my own toilet.
Made back my $24 one time when I cleared a toilet drain for a customer.
About 2/3 of the way down, a reasonable description of what to do.
Pull the snake all the way back, slip the curved tip into the drain. Push
the snake in, cranking as you advance the closet auger snake. Keep cranking,
as you push it all the way in. Then flush the toilet, to rinse off the
snake. Crank, while pulling back on the handle. Finally, remove the unit
from the bowl. Extend the snake, and clip the snake onto the place at the
Hope that helps.
Christopher A. Young
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The bowl fills with inflow water. It doesn't flush, sometimes it does
clear, slowly, other times it stays that way for hours.
The shower and sink drain to the same septic and never have drain problems.