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We have just had a vessel sink installed, by a plumber and it drains very slow. It has a pop up drain. The plumber said that those sinks are just for show. I have seen and used a lot of these and they worked fine. Any help would be appreciated. Oh, and it is vented, but I have seen something about a vent around the p- trap.
 

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Has the guy who installed it partially blocked the plug and waste with the silicone he sealed it to the sink with? unscrew the trap from the waste and check from the downstream side.
 

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no probs, what type of vent is it? if it's an air admitance valve you can disconnect it and see if the discharge improves, if it does it should be the vent, check the trap for blockages, run a hose in the discharge pipe to check if the water gets away through the pipe. basically just work your way downstream til you find the problem.
 

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We have a vessel sink in both of our bathrooms. One has a popup drain, and drains better than most "regular" sinks. The other does not - the sink is some weird size and I can't find a popup drain to fit it.
 

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Every one that I have installed works just as you are describing it.

There is one particular popup drain that we have found that makes it drain like a regular sink.


Think about this : What happens when you use a regular bathroom lavatory? Drains good? It has an overflow, that helps let the airlock out of it. Your vessel doesn't have one of these does it?

Try swirling your finger around the drain when it starts going slow OR unscrew the part of the popup that you push up and down, and i bet it'll go down just fine.
 
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