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Why does the shower overflow when I use the bathroom sink?

Updated: 8/16/2019
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14y ago

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You have a partial blockage downstream of where the shower drain & the sink drain join into one pipe. You could try a thin plumber's snake, or add some drain cleaner, some bleach, or vinegar. About a liter of vinegar is the safest and should work well enough.

Davis

(davisbigelow.blogspot.com)

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14y ago
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Q: Why does the shower overflow when I use the bathroom sink?
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