I have a problem with my drainfield. Everytime I do laundry or the family takes showers (there are six of us) there is water that goes into the drainfield. I am wondering if I need to have the tank cleaned or if it is a problem with the drainfield itself. The drainfield is not up high like others in my area. Our soil is extremely sandy. Please help!! The water does go down after several hours though.