I had a sewer enjector installed in my basement for an apartment. I am now having prolems ever since the contractor came back to install a trap. The enjector was installed right next to my heating furnace so when the furnace turns on which is forced hot air. My upstairs stinks like sewage. This happens mainly when my son is showering downstairs & the pump is kicking on a lot. I have no idea what to do. I had the contractor come back and all he did was put some caulking around the top of the pump. I hope some can help me I can not stand the stench & I guess the idiot I hired doesn't know what he's doing.
Thanks