I have odor from my sewage ejection pump, what can I do?
I have a duplex sewage ejection pump unit for my downslope house for a little more than 3 years. The pump work fine, however, lately we have some odor come out from one of the shower drains when we are taking shower on the other two bathrooms or when I wash my dishes. There should be no leak, because it doesn't smell at all nearby the pump. It just the odor come out from one of the bathroom. I know each bath room fixture should a p-trap, so I don't think the pipe for that bathroom is bad or anything wrong with it. The odor get stronger and stronger lately. We even thought about a dead mouse of something in the pipe to cause the smell, but I still think it doesn't make any sense, because it only smells when we have large amount of water runs down to the sump.
Can anyone suggestion solution for us please?
Thank you so much.