Is there an one way ticket for Xima pool of Cangshan Mountain?

I want to take a course
: Gantong cable car (one way) -> Walk -> Xima pool middle - lower (one way)
Is there an one way ticket for the Xima pool cable way?

And if not, can I hike down from Xima pool middle station to lower station?

How much time does it take?

Thank you ;)