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Hot Tub Chemical Damage


Hot Tub Repair

Simple Hot Tub Chemistry

  1. Hot Tub Chemistry Fundamentals

  2. Why you can't treat a portable hot tub like a Swimming Pool

  3. Total Alkalinity & pH

  4. Sanitize & Oxidize

  5. Step-by-Step Hot Tub Chemistry Checklist with dosage tables

  6. Simple Hot Tub Chemistry Selector

  7. Hot Tub Chemical Damage

Hot Tub Water Conservation

Hot Tub Electrical Safety

Excess Sanitizer/Oxidizer

If you have read through the Chemistry Fundamentals page or the Not a Swimming Pool page you've seen several references to chemical damage. This is what it looks like.

Excess sanitizer/oxidizer is the leading cause of damage in portable hot tubs. The first indication of sanitizer overdose is often a big bleach mark on the bottom of the hot tub cover that matches the waterline of the tub. Bleached out or deteriorated headrests are also an early sign of this kind of chemical damage..

Damage from excess sanitizer/oxidizer can be caused by two very common mistakes.

  1. Adding Chlorine or Non-Chlorine Shock then closing the cover

    Whenever you shock the water the chemical reaction that takes place can give off caustic gasses. If you toss a tablespoon or two of Chlorine in the water and immediately close the cover that gas gets trapped in a sealed tank and can slowly bleach out everything between the waterline and the bottom of the cover.

    To avoid this: leave the cover off for ten or fifteen minutes after adding Chlorine or Non-Chlorine Shock.

    It's a good practice to turn on all the jets (and blower if equipped) whenever adding chemistry to your hot tub. Most modern tubs with digital displays will turn everything off automatically after a 20 or 30 minute timeout.

    Turn the jets on when adding chemistry. Wait until they time out to close the lid.
    *Otherwise: Run jets for at least 15 minutes. Turn off manually. close the lid.

  2. Adding a 'daily dose' when the hot tub doesn't need it

    An uncovered swimming pool gets contaminated with a daily load of dust, pollen and other debris whether or not you swim in the water.

    A covered hot tub is more like a sealed tank. Without a daily load of contamination, your hot tub does not need a daily dose of sanitizer or oxidizer to keep it clean.

    A floating tablet dispenser works in an open swimming pool because it has a daily load of contamination. The dispenser releases a daily dose to replace loss cuased by the daily load of debri blowing into the uncovered pool.

    A covered hot tub only has a daily load if you sit in it every day. However, just like in a swimiming pool, floating tablet dispenser will release a daily dose whether or not you sit in your hot tub.

    If you don't use the hot tub for two weeks, the floating tablet dispenser will still release two weeks worth of daily doses which quickly overdoses a hot tub with no daily load.

    Improperly managed floating tablet dispensers are the leading cuase of chemical damage in portable hot tubs. Remember to adjust dispenser output based on bather load.

    If you don't plan to sit in the tub for a period of time, remember to decrease the tablet dispenser output or remove it entirely.

    Floating Chlorine/Bromine Dispenser Instructions

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