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Originally Posted by overlander63 Do you let the black tank fill before draining it, or are you leaving the drain valve open all the time? |
Matthew,
I have cleared 'more that one' black tank clog. Some are easy, most are difficult to impossible. It's important to know if you have been leaving the black tank valve open while connected or not.
It it HAS been open, then you have what's known as the 'black hills' residing in your tank. This is caused by insufficient water from each flush letting the liquids drain and the solids remain.
The accepted technique is to let the tank fill and then drain it in it's entirety, flushing it 1 or 2 times after that.
If you do indeed have Black Hills Syndrome, the only way I have found to clear this is to fill the tank with water, call a local septic service that has experience with RVs AND HAVE THE TANK PUMPED!
This is the only method I have used that works every time.
