Trouble in the basement laundry room....washing machine floor drain is not keeping up with the draining water even on a small load. The downstairs toilet and shower are all fine, upstairs all is draining as well. Last couple of laundry loads would have caused a small flood if I hadn't run down to shut off the washer (have a water sensor alarm near the drain). My question...would this just be an issue right at the laundry drain or would it be further down the line outside ie tree roots.....and is there something I can do right at the drain, like liquid drano or use a toilet auger (would have to buy). thanks for any input.