Do I use the same math on the (inflatable) hot tub that I have been using on the pool for years? And a few other questions..

On a hot tub can I be using liquid CL like I do on my pool? On the pool I do just liquid CL once the stabilizer is adjusted and it happily keeps going, I test and check and add and use the calculator and we keep swimming all season long.

Came into possession of an inflatable hot tub for Christmas. Despite it being a hot tub do I use the same FC/CYA chart I have been using for years or is there a different metric I am supposed to be basing this off of since it's a hot tub and not a pool...

Do I use the same math on the (inflatable) hot tub that I have been using on the pool for years? And a few other questions..