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the normal body temperature of 98.6°F (37°C).
Symptoms include dizziness, fainting, drowsiness,
lethargy, and an increase in the internal body
temperature.
The effects of hyperthermia include:
• Unawareness of impending hazard
• Failure to perceive heat
• Failure to recognize need to leave spa
• Physical inability to leave spa
• Fetal damage in pregnant women
• Unconsciousness resulting in a danger of
drowning
3F. Swimming Pool Energy Savings Tips
Teledyne Laars suggests the following to help
conserve fuel and minimize the cost of operating your
pool heater without sacrificing comfort.
1. Set the heater temperature control no higher than
78°F (26°C). The American Red Cross maintains
that the healthiest water temperature for
swimming is 78°F (26°C) is. Be certain you are
using an accurate pool thermometer, because a
variance of 4 degrees, from 78 to 82°F (26 to
28°C) will use as much as 40% more gas.
2. Carefully monitor the water temperature of your
pool in the summer time, because heater usage
can be reduced due to warmer air temperatures.
3. Find the proper setting on the pool heater
temperature control and use the TEMP-LOK to
discourage further adjustments.
4. Set the filter time clock to start the pump no
earlier than 6:00 AM during the pool heating
season. This is the time when nightly heat loss
stabilizes.
5. If the pool is only going to be used on weekends,
reduce the heater temperature control setting by 8
or 10 degrees during the week. It should be reset
to the 78°F (26°C) level before expected usage,
keeping in mind to allow enough lead time for the
water to reach the desired temperature.
6. During the winter shut down the heater by
following the lighting and shutdown instructions
in Section 3A. When on vacation for longer than
a week, make sure the heater is shut off at the
temperature control panel.
7. Where possible, shelter the pool from prevailing
winds with well-trimmed hedges or other
landscaping, cabanas, or fencing.
8. Always use a pool cover when practical. Besides
providing a valuable safety feature, a pool cover
will reduce heat loss, conserve chemicals, and
reduce the load on filter systems.
3D-2c. Corrosion
The corrosive action of pool/spa water is
increased by the following:
1. Low pH - acidity
2. Low Total Alkalinity - bicarbonates
3. Low Calcium hardness - soft water
NOTE: Teledyne Laars does not warrant heat
exchangers damaged by corrosive water.
3D-2d. Testing
Teledyne Laars recommends that spa owners
purchase a test kit and use it regularly. A minimum kit
is one which will measure chlorine and pH levels.
The pool/spa owner will find it helpful to have a
qualified professional technician perform more
extensive chemical testing and water changing on a
regular basis.
3E. Spa/Hot Tub Safety Rules
The following "Safety Rules for Hot Tubs,"
recommended by the U.S. Consumer Product Safety
Commission should be observed when using the spa:
1. Spa or hot tub water temperature should never
exceed 104°F (40°C). A temperature of 100°F
(38°C) is considered safe for a healthy adult.
Special caution is suggested for young children.
2. Drinking of alcoholic beverages before or during
spa or hot tub use can cause drowsiness which
could lead to unconsciousness and subsequently
result in drowning.
3. Pregnant women beware! Soaking in water above
102°F (39°C) can cause fetal damage during the
first three months of pregnancy (resulting in the
birth of a brain-damaged or deformed child).
Pregnant women should stick to the 100°F (38°C)
maximum rule.
4. Before entering the spa or hot tub, users should
check the water temperature with an accurate
thermometer; spa or hot tub thermostats may err
in regulating water temperatures by as much as 4
degrees Fahrenheit (2°C).
5. Persons with medical history of heart disease,
circulatory problems, diabetes or blood pressure
problems should obtain their physician's advice
before using a spas or hot tubs.
6. Persons taking medications which induce
drowsiness, such as tranquilizers, antihistamines,
or anticoagulants should not use spas or hot tubs.
Prolonged immersion in hot water can induce
hyperthermia. Hyperthermia occurs when the internal
body temperature reaches a level several degrees above