The past couple of weeks I've noticed that every time we do laundry on our first floor, the main drain the the basement backs up and the area around it fills with water. There is also a toilet in the unfinished part of the basement that has started to have water seep through the bottom as this is occuring. It seems to happen only when doing laundry (I'm guessing because of the volume of water). Do I have a clog? Any ideas? I thought about getting some drain-o type product or a snake, but I don't know if there is a clog or not.