We have a vessel sink, installed by a plumber and the sink fills half way before it drains, and it drains with a lot of suction after it fills half way.
The plumber tells us this is normal, I can't believe it
Can you please confirm that he is right, and if not how I would go about fixing it
Thank you

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Originally Posted by YARNMAN

We have a vessel sink, installed by a plumber and the sink fills half way before it drains, and it drains with a lot of suction after it fills half way.
The plumber tells us this is normal, I can't believe it
Can you please confirm that he is right, and if not how I would go about fixing it
Thank you

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This is normal -- And the only real fix is to replace the grid or pop-up drain assembly with a flip-top drain assembly.

Follow Growlers advice and install a flip-top vessel sink drain,(see image).
Good luck, Tom