I believe it is not the paper you use, but how you dump your tank. It takes at least a 50% full black tank, along with gravity, and at least a couple 50% dumps to clear the tank properly.
I have used Costco brand for 15 years in my rv, since it came individually wrapped in paper. Now I use another brand they carry, that also comes individually wrapped. I am a creature of habit. I use "Happy Camper" each time to keep tank clean and remove odor.
Years ago, I paid a few years in a row, to have my black tank scoped and cleaned by a service. He told me, I was wasting my money with him, my tanks were clean, with no buildup for him to clean out.
As part of his service he guaranteed tank level sensors would work. That is how I started using him after acquiring a new to me rv with inoperative senders.
I use a "Flush King", always 50% filling black tank several times and dumping till it runs clear thru transparent fitting. Flush King acts as a third valve and gives an easy way to refill black tank.
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