I have had some indications that bromine is the sanitizer of choice for hot water applications. I am buying a used hot tub (fiberglass) and am thinking I'll prolly use bromine. I've learned a little about it, but I still have Q's.
When filling, apparently one must use some sort of start-up (like "Go Brom") to activate the bromine. . it's slow-dissolving or something? I'm not entirely clear on the whys and wherefores of that.
What about cleaners? There seem to be a wide array of them, and the marketing materials indicate one needs more than one. There's spa cleaner, and spa gloss. . . suggestions? Does one really need specialized cleaners or is that just hype?