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In fact, to my surprise, a salesman at one of the dealers suggested it wasn't necessary and mentioned that he has a 5 year old tub and does fine without it. I suppose I'm just trying to find the positives and negatives of it. Any feedback you could provide would be greatly appreciated.
It is NOT necessary but in my experience it does help and the one way I know is the times when people have water trouble with a new spa and typiaclly I've found the ozonator has an issue and not being operational (often just a pinched hose, bad check valve... minor start up stuff). When ozone is working the early water care issues seem much less. Not exactly scienticially proven but enough for me to draw a conclusion that it is helpful. Its not some magical elixir that takes work away for you, it simply lessens the chances of having water care issues and you won't save an equivalent $ amount in chems by using it, just some peace of mind IMO. If you can afford it I'd go for it, if you're at all skeptical or its too pricey just skip it and you can add it at any time down the line since its VERY simple to install.
Thanks spatech. I posted this on PSF as well and one of the responses there was that the ozone isn't as beneficial on a tub like the Tempo that does not have a 24 hr circ pump. Would you agree with that assessment?