To make a long story short; I have a slow draining tub. It has been this way since I bought the house. It is a ranch built in '78. I plunged, and snaked the drain with little success. It was still slow draining but not as bad. A few weeks later it was right back to where it began. I got fed up yesterday and replaced all of the 1 1/2" pvc from the stack to the p-trap, only to find that the old was not clogged. I realize while replacing the old drain, that there are an awful lot of turns and it is a bit of a long run to the main stack. Now I'm wondering if this is a venting issue. I could use some advice. If it is a vent issue, are there any easy fixes? Or do I need to run a vent stack up to the attic and then 45 it to the main vent, or make a new one through the roof?