I've encountered it in several places, mainly in public/hotel toilets, but also in my sister's old apartment, where people are asked to not throw anything (except for bodily waste) including toilet paper in to the toilet as it could cause a clog in the toilet bowl itself or the plumbing.
Throwing used toilet paper to a garbage bin that sits in the toilet always seemed disgusting to me, but there are people who do it due to fear of a clog. And the notion that tissue paper can cause a clog always seemed ridiculous to me as it seems that tissue paper dissolves and tears up in water really easily.
Can a normal amount of toilet paper used in one "sitting" made of tissue paper alone, together with bodily waste, cause a clog in a modern toilet/properly maintained plumbing?
Could it cause a clog in an old toilet or unmaintained plumbing?
Does this claim have any root in real cases that happened?
- I'm talking only about tissue paper toilet paper, not about wipes, toilet towels or any other fabric or paper product that isn't made of tissue paper.
Related question: Are "Flushable" baby wipes flushable?