okay i have some strange plumbing for my kitchen and laundry room. I have been using the washing machine for over a month now and it has just started to back up into the kitchen sink. any ideas how i can fix it.
the elbow in the corner comes from the laundry.
the black pipe might be an old waste line, but i don't know since the house came with washer and it was hooked up to the white pvc. there is a vent pipe on the roof but it come out above where a cabinet is.