Floating rust is a layer of rust that floats on the spiral pipe and can be removed with a towel or other things. Simply put, floating rust is considered to be no rust and is a normal state.
The rust on spiral pipes refers to the serious rust phenomenon such as pits on the surface of the pipe body after being exposed to wind and sun for a long time (at least 1 year). This is the key feature to distinguish floating rust from rust.

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