My experience:
My wife is *extremely* sensitive to strong smells... even had to close a business down once and move to an outdoor flea market because there was something in the building that irritated her throat so bad she couldn't breathe. Owners, customers, and I couldn't smell anything, but it shut her down.
We got a tub and I didn't even think about chlorine, knew she wouldn't be able to take it. We went with bromine/bromide/whatever it is, and she could take it for 15 minutes tops as long as she didn't breathe in deep... *if* everything was in perfect balance.
Did some research on the net, and went with Cleanwater... she loves it! We can spend as much time in the tub now as we want. We used to get out as soon as the 15 minute cycle stopped, but now we'll often sit in the nice quiet tub for another bit of time, just relaxing and looking at the stars. Smell *never* bothers her now, which makes me a happy camper.
Never any discoloration, algae, or anything of the like. Maintenance every two weeks... drain and clean every few months.. life is good. I can *highly* recommend this stuff, and no, I don't work for them, get any kickbacks, etc., etc.
