I have a bathroom that has two sinks. The drain on both of them is slow. I have tried all the various drano types with little or no improvements. I tried using a water balloon thingy that attaches to a hose and inserted it deep into the vent pipe from the roof until it reached the floor. I was thinking that the water pressure will blow out the obstruction and to my surprise the water overflowed from another vent pipe inside the attic that I did not know existed because it is burried under the AC/furnace train. Needless to say that backfired. Now I am at loss of how to proceed. I know I have an obstruction (probably hair) that is far down the drain. I would like to use a snake but I am afraid that I could not tell where the snake will end up because of the maze of drain pipes and vent pipes behind the wall. Any ideas?
Thanks, Joseph