Whether it is self made concoctions or store bought black tank chemicals, neither works without sufficient water. If you have time fill it with water and let it sit, if in a hurry add sufficient water and get to busting a poo mountain. Although I have explained to my DW, 3 DDs, and 1 DS about using more water for solids, it is ultimately up to me to add water as I am the one that gets to perform the dumping ritual, mostly unassisted. No biggie really, just add a few gallons back into blank tank via onboard tank flush rinser after final rinse, we never leave black tank dry.