I have a query regarding new vanity basins with overflow holes (especially the square style vanities). Why are these part of the design? Where does the water go that ends up in these holes? The reason I ask is we recently stayed in a new apartment with these basins and they had a terrible odour. We now believe these basin holes help breed mold and germs as splashes of water stay trapped within the cavity or does this water end up in the waste pipe as part of the basin design?
Anyone installed these basins? What are your thoughts?