A.O. Smith PEARL ULTRA User Manual page 11

Do not use the product in conditions under 1°C!
If the ambient temperature falls below 1°C,
please be sure to take measures to prevent
freezing, such as turning on a heater
or air conditioner to prevent leakage
or cracked pipes caused by water freezing
inside the equipment. The required
environmental temperature for softener is
between 1-39 °C.
Do not use this water softener cabinet
outdoors!
If this product is used outdoors, it can lead
to accelerated aging of the product.
Do not place the water softener cabinet
under direct sunlight!
Placing the water softener under direct
sunlight for a certain period of time may
create a breeding ground
for microorganisms; and potentially causing
the internal components of the water
softener to become contaminated.
ENG 9