5
WATER CHEMISTRY
Chemical imbalance can cause severe damage to
your heater and associated equipment. Maintain your
water chemistry according to Table A. If the mineral
content and dissolved solids in the water become too
high, scale forms inside the heat exchanger tubes,
reducing heater efficiency and damaging the heater. If
the pH drops below 7.2, this will cause corrosion of the
heat exchanger and severely damage the heater.
Heat
exchanger damage resulting from chemical imbal-
ance is not covered by the warranty.
For your health and the protection of your pool equip-
ment, it is essential that your water be chemically
balanced. The following levels must be used as a
guide for balanced water.
•
Occasional chemical shock dosing of the pool or
spa water should not damage the heater providing
the water is balanced.
•
Automatic chemical dosing devices and salt chlo-
rinators are usually more efficient in heated water,
unless controlled, they can lead to excessive chlo-
rine level which can damage your heater.
•
Further advice should be obtained from your pool
or spa builder, accredited pool shop, or chemical
supplier for the correct levels for your water.
Automatic Chlorinators &
Chemical Feeders
All chemicals must be introduced and completely dilut-
ed into the pool or spa water before being circulated
through the heater.
Do not place sanitizing chemi-
cals in the skimmer. High chemical concentrations
will result when the pump is not running (e.g.
overnight).
Chlorinators must feed downstream of the heater and
have an anti-siphoning device to prevent chemical
back-up into the heater when the pump is shut off. See
Fig. 1.
NOTE:
Corrosive water voids all warranties.
CAUTION:
Free chlorine must not exceed 5 ppm
which can damage the heater and void the warranty.
NOTE:
High chemical concentrates from feeders
and chlorinators that are out of adjustment will
cause rapid corrosion to the heat exchanger.
Such damage is not covered under the warranty.
Recommended Level(s)
Fiberglass Pools
Fiberglass Spas
Other Pool and Spa
Types
Water Temperature
68-88°F (20-31°C)
89-104°F (31-40°C)
68-104°F (20-40°C)
pH
7.3-7.4
7.3-7.4
7.6-7.8
Total Alkalinity (ppm)
120-150
120-150
80-120
Calcium Hardness (ppm)
200-300
150-200
200-400
Salt (ppm)
4500 Maximum
4500 Maximum
4500 Maximum
Free Chlorine (ppm)*
2-3
2-3
2-3
Total Dissolved Solids
(ppm)
3000 Maximum**
3000 Maximum**
3000 Maximum**
*Free Chlorine
MUST NOT EXCEED 5 ppm!
** In salt water chlorinated pools, the total TDS can be as high as 6000 ppm.
Table A: Water Chemistry
