Bruce
Herd Master
Are the gray water and black water all ending up in the same leach field? If so can the grey lines get put into the black at there rear of the house? If not why does the grey need to be pumped out back? The usual purpose of separating grey and black is so you can use the grey for irrigation.it will require a separate tank for the washer gray water (which I think may also include the shower and kitchen sink) because that outlet exits in the front of the house and the black water exits behind the house.