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Hot Tub Chemistry and Filtering

or search frequently asked questions:

Hot Tub Water Chemistry FAQ
Hot Tub Chemicals Setup
How do I test, balance and maintain my spa water?
How Do I Change the Filters on My Hot Tub?
We have an ozonator. Our spa is 360 gallons. How much sanitizer should be used each week - normal bather use?
water is clear and green in hot tub how can we get rid of it without changing water?
What's the difference between the Chlorine chemicals & the Bromine chemicals for the soft tubs?