If the water comes up in the shower, it may be because it has no vent. If vented, the pressure from plunging would have a place to go. Terry

: We have a finished basement with a full bath. The waste drains into an ejector pit which has a new pump.
: Sometimes the toilet clogs and a plunger is needed. However if the plunger is used, the water just
: comes up the shower drain. How can I use a plunger to unclog the basement toilet?