Bathroom Sink-Baffled

[Andy49]

Single Story house. Two sinks in the master. One is clogged. Tried 15' augur. No help. Turned off water supply to the sink. Plumber coming tomorrow. Mystery is that the sink is filling up slowly after the augur. Where is the water coming from? The water seems clean.

 

[Andy49]

The plumber came out today. Unclogged the sink drain with a longer auger. The mystery of sink filling with the clean water got explained. The AC drain line was connected with somewhere with the sink drain line.