Why can’t a line be cleared when a septic tank is full?
A. Actually a line that drains to a septic tank can be cleared, however if the tank is still full the line will not be able to drain until the tank is pumped. When a septic tank becomes full solid wastes which collect at the top, the stoppage can be pushed into the main line so that even after the tank is pumped the line may still not drain. It is for this reason that Rooter-Rite recommends that you always have the mainline run after you pump the tank.
