Ivylog wrote:
The inlet to the septic tank is probably PVC and I would use 3" thin wall PVC if you can find it (it will fit into the adapter for your normal sewer hose) or 4"...no need for schedule 40 or gluing. Sometimes the thin wall is outside in the landscaping department. I would create some slope using bricks to help it drain. No need to pump the tank as a RV uses 1/5 th the water of a mobile home.
Pumping the tank has nothing to do with the amount of water the RV uses. Knowing that the system will weep and then pumping the tank will assure that the system works and he is not spending money or moving onto a lot with a system that doesn't work.
It's common practice and often required by municipalities or mortgage companies each time the property changes hands. So does he want to know if the system is good before or after he gets involved? It could be a $5,000 question.