A.O. Smith PEARL ULTRA User Manual page 8

Observe drain line requirements!
The drain line must be a minimum of ½ inch
R
diameter. Use ¾ inch pipe if the total length
R = ½ inch
of the drain line exceeds 6 meters.
A drain line should be connected to the water
softener cabinet!
To get the maximum efficiency from
the water softener cabinet, a connection
to the drain line should be made.
Do not use the water softener in areas,
where the water conductivity is ≥ 2000 µS.
Water softener cannot function properly
if the water conductivity is greater than
≥ 2000 µS
2000 µS.
ENG 6
Do not use this water softener under
high water pressure conditions!
Operating under high pressure conditions
may cause the water softener pipes
to rupture, resulting in leakage, the machine
working improperly, or even serious property
damage.
The input water pressure must be between
1.5 bar to 3.5 bar (0.15MPa to 0.35MPa.),
no negative pressure allowed.
Pay attention to the standard hardness
of raw water and water usage quantity!
If water usage or hardness of raw water
dramatically increases comparing
to the normal usage, the frequency
of regeneration should also be increased.
Do not use water during regeneration!
During regeneration time, water from tap
will NOT be softened. It is not recommended
to use water during regeneration; otherwise,
a negative effect on the regeneration result
will occur.