Most consumer products, other than prescription drugs (for example), don’t have very strict rules about what the manufacturer is allowed to claim. As long as they can be safely flushed in some circumstances, they’re allowed to be called flushable, even though there are many circumstances in which they can cause damage.
Most people aren’t in a situation where they can tell whether it’s safe on their specific system. And the people who operate sewage treatment plants don’t want to do the experiments to determine whether their entire system can handle the wipes, so they just discourage them.
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