My laundry drains to a grey-water field and I've had no problems with it for several years. Doing a kitchen remodel now and need to wash my dishes in the laundry room sink. Now my washing machine (which shares a line with the sink) overflows every time. I have had it snaked, vented, throw enzymes down it, all with no response. I don't want to have to destroy my yard to dig up the grey-water perforated pipe. HELP!:)