We noticed that one of our less used bathroom sink ( daughter's room , she is away at uni) was full of clear water . The sink has not been used for a month. My H put some Drano & water drained slowly.The sink always has a problem with slow draining(I suspect D put hair & other things into sink !)
Our AC condensate line is connected to that sink area. Our AC units have been working continuously for past couple of weeks .
What must have been caused the water collection ? Should I call a plumber or should I pour more chemicals down the drain ? If this is DIY issue how should we tackle this ?
Thanks in advance