Don’t know if it’s free or not, but I really wouldn’t recommend taking the elevator inside. There are no views, it’s not made of glass, and it only takes a minute to reach.
Is the teacher’s card free at the Chishui Danxia Grand Waterfall?

Chishui Danxia Great Waterfall: Military veterans with preferential certificates and ID cards are exempt from tickets, but the scenic area sightseeing bus and elevator are paid for.
Is it fun to drift inside? How is the water quality? I haven’t seen any tickets for the drift inside for sale online.