We usually only go out for weekend trips and have been using Kirkland (Costco) paper. I have recently noticed that the paper does not break up. We use plenty of water, and since we normally dry camp, we have to drive to the dump station before dumping. Even after the drive, when I watch what is coming out through the clear elbow, I see the paper coming out in whole clumps. Not broken down. Also, not all of it comes out. If I refill the tank and dump again, more paper comes out. I recently tested the paper in a jar of water and it stays together really good, even after 24 hours. Because of this, we just ordered some Scotts single ply. Will report back how it compares. I do believe that some brands dissolve a lot better than others. I have never had a clog with the Costco paper, but it has taken many rinses to get it all out.