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My sump pump stinks up by basement. The sump pump works, but I think its the stagnant dirt water that sits in the sump pump over time that just stinks after a while. I have read suggestions to flush it with water every once in a while, or throw some bleach in there, but those seem like temporary solutions. Is there any way I can either trap the air/smell and/or keep it from stinking more long term?

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Dumping bleach in the water risks corrosion of the pump, damaging it before long. A periodic flush may be a better choice.

You can top the crock with a piece of plastic, done in homes with radon mitigation systems. Note that this top must be properly done so as not to create an airlock. A trapped drain is built into the top.

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