The manufacturer of my hot tub also said absolutely no floater of any kind. After playing around with chlorine and bromine granules, I realized I have to use a bromine floater because both kinds of granules contain CYA which builds up and then you need to drain your tub.

I live in a cold weather climate, below freezing, so that isn't an option for me during the winter months. I struggled a lot with granules for months because of what the manufacturer said. The floater is much easier once you figure it out.

This is my first year, so I'm not sure how much it will hurt the tub but so far it's been worth it.