Hot Tub Repair
Simple Hot Tub Chemistry
- Hot Tub
you can't treat a portable hot tub like a Swimming Pool
Alkalinity & pH
Hot Tub Chemistry Checklist with dosage tables
Hot Tub Chemistry Selector
- Hot Tub Chemical
Hot Tub Water Conservation
Hot Tub Electrical Safety
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
- 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.
- 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
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
Chlorine/Bromine Dispenser Instructions