Hi, the sink in our master bathroom is 'burping' about 2-3 seconds after we turn off the water IF we are draining anything other than water(like toothpaste, hand soap, etc). If it is just water it does not do it. I have so far tried the bleach/hot water suggetion on this site and that did not work. I then tried drano twice and it still did not work. Finally, I removed the stopper & managed to pull out a huge clump of hair and to my amazement the sink is still burping! :mad: The funny thing is the sink drains fine, but this noise it makes is driving me crazy. Is there any other DIY stuff I dare try or is it time to call in a plumber? Thanks!