I have a mid-50's Cape in the Northeast with a cesspool for sewerage and a drywell for greywater.
Cesspool works fine with an annual pumping.
The drywell, installed by the previous owners, overflows back into the washing machine on a consistent basis, more noticeable during rainy weather and when more than one load is performed within a 48 hour period.
I have dug the system up and it is a concrete cyclinder sitting on top of a bed of gravel - covered with plastic strips. The drywell itself is located approximately 8 - 10 feet from the foundation and with 15 - 20 of the cesspool.
My question, is simply expanding the gravel bed the best solution or should I run an overflow pipe out the other side of the cycliner slope it out over 20 -30 feet like a traditional leaching pipe.