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Slow drain fast drain

2K views 7 replies 4 participants last post by  VIPlumber 
#1 ·
My bathroom sink, a vessel sink, drains really slowly at first and then after about 2-3 inches of water builds up suddenly starts draining really fast, almost making a sucking noise. Then it looks like the water only drains down as far as the bottom of the sink instead of further down.

Whats going on?
I can post a video of it later if an example is needed.
 
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