PoolRX+ spa Unit 100-400 gallons

I have a Saluspa inflatable hot tub. Can I just put it in a floating chlorine dispenser? it won't fit in the folds of the filter.

Do you recommend using shock treatment in addition to this product

I use bromine, not chlorine, in my spa. Does it make a difference?

Would it be crazy to put this in my intel fast set swimming pool? The one with the inflatable ring around the top. It’s about ten feet across/2ft deep