Hello. I have a question. Our tub drains slowly. Not ridiculously slow, but enough to where the water is about ankle deep by the time I am done showering. I dont see anything nasty floating in the water or anything. I rarely smell anything bad in the water either. However, today, I noticed a slight hint of sewage smell at the end of my shower as the water was draining. It wasnt strong. Just a slight hint of it. Infact i leaned over near the drain to be sure I was smelling it. Anyway, this water thats backing up. Would that most likely be just from a simple tub drain backup? Or could it also be tied it with the toilet line? My main thing is, is it possible I am standing in toilet waste water? Or just my own dirty shower water? Also, I live in a duplex. Could the tenant upstairs toilet water pass through the same lines, to where i could be standing in his waste water? Hes a bit dirty, and i would be scared of possible hepatitis. Like I said, it normally just looks like soapy water. I dont ever really notice anything nasty that would seem like toilet waste. It almost never smells. I just noticed a slight smell today, and thats been in. And I have never seen anything back up into the tub when flushing. Please let me know if this sounds like a simple tub drain problem. Or if this is a real health issue with possibly standing in toilet waste water. Thank you!