We had subfreezing temperatures last week around Christmas so (I had another thread about what I did) part of the getting ready I put antifreeze down the tanks including the black. I had to try draining yesterday and it wouldn't. There was "debris" that came out at first and then a pretty good-sized "plug" but since then, nothing else. I left the gate valve open and it drained down to level two on the control panel. I bought a Camco 39082 Rhino Blaster and all I got was confirmation that the gate valve is working. The outlet to the tank has to be plugged. Short of dismantling the joint there, is there anything else I can try? Will likely call a mobile tech if I have to dismantle it. FYI, I use the Bio-Geo method of cleaning very often and did when we camped in the middle of December. Appreciate any help.
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