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.

Can you be more explicit? In your heading you say,

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I have odor from my sewage ejection pump

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but later you say,

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it doesn't smell at all nearby the pump.

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This has ne confused. If the smells only come from your drains let's focus on them. Most bad odors in bathroom drains come from rotting hair mixed with grease from the soap. Try this. Remove the two screws holding the strainer. (TIP; put the screws in the soap dish before they get lost down the drain.) Shine a light down there and with a bent coathanger fish out any hair that may be hiding down there. Then pour a 1/2 gal. of bleach down into the trap and let it set over night. Next morning flush the mess down with 2 large pans of boiling water, (this is important). The bleach will dissolve the hair and make it slippery and the boiling water will melt the grease and get the mess out of your drain. Smell better now? Cheers TOM

Hi Tom,

Thanks for your quick response. I will try your suggestion with the bleach down the drain. Just one quick side note, I don't even use that bathroom for shower, I would said there is less than 20 times of shower in the past three years. It is more like a back up or guest shower for the house. I also heard that we should open the sump and clean the tank with dish soap every year, does it sound right to you?

Ychow