20
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)
3000 Maximum
3000 Maximum
3000 Maximum
Free Chlorine (ppm)*
2-3
2-3
2-3
Total Dissolved Solids
(ppm)
1500 Maximum**
1500 Maximum**
1500 Maximum**
*Free Chlorine
MUST NOT EXCEED 5 ppm!
**In saltwater chlorinated pools, the total TDS can be as high as 4500 ppm.
Table H: Pool Water Chemistry
Pool/Spa Water Chemistry
Chemical imbalance can cause severe damage to the
pool heater and associated equipment. Maintain the
water chemistry according to the chart below. If the
mineral content and dissolved solids in the water
become too high, scale forms inside the heat exchang-
er tubes, reducing heater efficiency and damaging the
heater. If the pH drops below 7.2, this will cause cor-
rosion of the heat exchanger and severely damage the
heater. Heat exchanger damage resulting from chem-
ical imbalance 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
should not damage the heater providing the water is
balanced.
Automatic chemical dosing devices and salt chlorina-
NOTE:
Chemical imbalance can cause severe
damage to your heater and associated equipment.
CAUTION:
Corrosive water can cause unwar-
rantable damage to the heater.
tors are usually more efficient in heater water, unless
controlled, they can lead to excessive chlorine level
which can damage your heater.
Further advice should be obtained from your pool or
spa builder, accredited pool shop, or chemical suppli-
er for the correct levels for your water.
Automatic Chlorinators and
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 chemicals
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.
NOTE:
Failure of a heat exchanger due to lime
scale build-up on the heating surface, low pH or
other chemical imbalance is non-warrantable.
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.
NOTE:
The allowable concentrations of salt and of the Total Dissolved Solids are lower for the XTherm than
for a typical residential pool heater, due to the higher water temperatures at which an XTherm operates.
