Please give us the model and year of your Montana. Most Monty's come with two black tanks showing on the panel, but only the ones with two toilets actually use the other one. My first thought would be that your black tank valve may not be closing all the way which would lead to the liquids leaving the tank and the solids staying. When you dumped what did it look like and how much came out?
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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