TP water jar test
It works, used the water jar test years ago with my first RV, now into number three, and no problem, still using the same TP. At any rate a certain brand of 'ultra' that came out several years ago would stop up a suction air flush it was so tough. I think they have modified it , but we don't buy it. I remember our plumbing costs from years ago and especially other cost from the kids stopping up the toilet.
If it dissolves/breaks-up in a jar of water, it is safe for the RV toilet.
__________________
|