Black water tank
A friend set his rv at a campground for the summer. He left the tank gate valve open and after several weeks he has a stopped up tank he can no longer use. He says the toilet is hooked to the tank by...
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Buy a bottle of Calgon water softener. dump it in with hot water until the tank is full of the hot water. Let sit one day. If you can get to the black tank straight down from the toilet, insert PVC pipe and stir what you can, dump what comes out, repeat until you think you have most gone. Then for the next few weeks, keep putting in the calgon water softener and blue treatments to try and remove all residue. This is a hard lesson learned. Be sure you use the Calgon in the laundry aisle - white bottle. It softens and makes all things slippery. Good luck.
