Aft Head piping from head to holding tank

[Sundancer]

The black water 1.5 inch piping from aft head to holding tank is plugged with hard material. Boat is 12 years old. Flushed with ocean sea water during that time. Plumbing router cannot break up this blockage. Anybody ever try to replace this piping? What has to be done? Anybody find some safe acid to eat thru the blockage?
:cry:

 

[KD3PC]

new lines will be your best bet...use some of the better grade hoses as they will prevent odor - longer.....

use of acid will only make the repair tougher...

replacing the lines is part of the maintenance of older boats, you may have tank issues as well, so plan for that in your process to replace.....it will be a chore to take up the floor and run the new hose, there are several hints here on how to make it easier...

all the best