Strange issue with bathroom Sink Draining

[kofi2003uk]

i have 5 bathroom sinks in a house and all drain fine except one in the main bathroom which is not used much due to other rooms having ensuites. this main bathroom sink drains perfectly when its only water(no soap). its fast as one would expect.

however as soon as soap is introduced, it bubbles and takes forever for the bubbles to disappear down the drain. i thought maybe too much soap is being used. however after using tiny amounts of soap when washing hands , the problem persists. bubbles stay and dry up and makes sink dirty. there is no blockage that i can see. P- pipe taken out and nothing blocking it. i didnt expect to see any blockage as plain water drains very fast anyway.

is this to do with the tap on the sink ? i thought maybe the tap is introducing too much air into the water but even after swapping the 'netting thingy' on the spout, same problem persists. very strange

any ideas please? none of the other sinks/taps have this issue.

thank you

 

[blup]

Change your soap

 

[kofi2003uk]

thought so. but same results. strange though how it happens with only that sink which on the face of it have the same set up/same bristan taps and we use the same soap in all bathrooms.
i guess am stuck with with. thanks for the response though.

 

[opps]

I am not a plumber... you could temporarily remove the diffuser (net thing) with a spanner and see if the problem persists.

 

[kofi2003uk]

I am not a plumber... you could temporarily remove the diffuser (net thing) with a spanner and see if the problem persists.

thank you so much opps. i think that was my about 80% of the problem. removing it have reduced the problem by about 80%. seems it introduced too much air bubbles. thank you. much appreciated.