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INST 396 Jacuzzi® J-HN Series Heater V12-16
CHEMICAL BALANCE
WARNING It is imperative that correct chemical balance be maintained in your pool and spa water, otherwise corrosion
of your heater may occur. Corrosion of the heat exchanger voids warranty. Your local pool shop specialist or spa retailer can
advise correct chemical balance. Your water should be checked and maintained regularly by a pool water professional. As a guide
the following parameters may be used.
4000 max. Excessive salt can damage your heater
You should test your water chemical balance at least on a weekly basis.
Excessive sanitiser can damage your heater. Chlorine should not exceed 3 ppm and bromine should not exceed 5 ppm. Salt
chlorinators, especially when used on spa pools or indoor or covered pools, can easily produce excessive chlorine levels which will
damage the heater internals.
CORROSION PREVENTION IN HEATERS
All Gas pool and spa heaters incorporate copper or copper nickel to make their heat exchangers as it is the most efficient material
in transferring heat from the combustion chamber into the water. The typical life expectancy of a well maintained pool/spa heater is
between 5 and 12 years.
The addition of sanitiser (Chlorine, Bromine etc.) and other water balancing and conditioning chemicals can increase the rate of
wear and tear on the heat exchanger and associated parts in your heater.
There are three most common reasons for heat exchanger corrosion which can be avoided with a little care and attention.
1. Excessive Sanitiser.
This means too much Chlorine or Bromine in the water. Be careful, if the level of Chlorine or Bromine is excessively high,
your test kit (and the pool shops) may not read accurately or indeed may show a nil reading. Any time a salt chlorinator is
operating for extended periods (when heating the swimming pool from cold), particularly if the weather is overcast or the
pool is enclosed or covered, the Chlorine level may exceed normal levels. When heating a Spa or Pool, turn the
chlorinator down or off for the duration of the heating period.
2. Out of balance water.
The water balance is a combination of pH, total alkalinity, Calcium hardness and temperature. Balanced water will help
prevent corrosion of your heater. Balanced water should be between a pH of 7.2 - 7.6.
3. The addition of acid to lower pH.
Acid must always be added in small quantities and spread over the pool surface evenly, not added in to the skimmer. Do
not add a Gallon at a time, add a cup full each day to lower your pH.
WARNING: If you have a salt chlorinated INDOOR pool or COVERED pool be very careful of the level of Chlorine being
produced. If you use a salt chlorinated spa be very careful of the level of Chlorine as the Chlorinator is usually sized for the pool
and therefore should be switched off when heating the spa. Leaving the chlorinator on can raise the chlorine level very rapidly in a
small volume of water.
These comments are intended as a guide only and are not definitive answers or recommendations on pool water chemistry. Astral
Pool’s intention is to provide a little understanding of the potential problems of water chemistry and the dangers of corrosion to
heaters (and other pool equipment and fittings).
YOUR WATER SHOULD BE ADJUSTED & BALANCED PRIOR TO ANY CORRODED PARTS BEING REPLACED.
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