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Discussion Starter · #1 ·
We have a strong sewage smell coming from the shower drain in the basement. The washing machine drains into this shower drain. The sewage smell only occurs at night. When we pour some bleach into the drain, the smell goes away, but it returns the next night.
 

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Could be a lack of vent for the floor drain, clothes washer or distance from a vent to the floor drain too great. Sounds like your washing machine is siphoning out the floor drain. Does it have a trap primer?

You shouldn't have to pour bleach into it. Just plain water and the smell should go away if this theory is correct.
 
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