You can do your own easy tp test. Put 2-3 sheets of tp in a glass jar of water and shake, if it falls apart it’s safe to use in the black tank. Septic safe or RV safe tp doesn’t have a binding agent in the paper and usually costs more to use. Many common tp brands don’t have binding agents, are cheaper, and are safe to use. Charmin Ultra Soft is what we use and have for many years without problems. Test your favorite tp yourself and decide for yourself, might find it fun. Happy hunting!
Dave & Myra
One day your life will flash before your eyes,
make sure it's worth watching!