Intex28502E B00PHX0D34 PureSpa Spa Seat, 1, brown

Has anyone tried this in a bath tub. Looking for something for an elderly person.

Does anyone use this seat in their coleman inflatable saluspa? is it ok to use in there? what do you think of it?

How do I get the intel inflatable insert for the top.

Can this be used in a softub hot tub?