
P a g e 5 0 • D R I - S T E E M D e s i g n G u i d e
D R I - S T E E M D e s i g n G u i d e • P a g e 5 1
H u m i d i f i e r m a i n t e n a n c e c o n s i d e r a t i o n s
Water hardness determines maintenance requirements
When choosing a humidification system, keep in mind that the
more minerals in your supply water, the more maintenance your
system will require.
Maintenance requirements for systems using DI/RO water
Humidification systems using DI/RO water require minimal
maintenance. Properly processed DI/RO water has no minerals or
other contaminants in the water that cause scale buildup. Therefore,
maintenance requirements for this type of system are:
• No regular cleaning (although regular inspections are
recommended)
• No skimming or drain and flush cycles (although end-of-season
draining is recommended)
• Regular inspections to verify that water processing equipment
is operating correctly. The presence of chlorides in improperly
processed DI water eventually causes pitting and failure of the
tank and its components.
Maintenance requirements for systems using potable water
The best way to determine how often your particular system needs
maintenance is to remove the tank cover and inspect it for mineral
deposits after three months of duty. Potable water carries a variety
of minerals and other materials in a mix that varies from location
to location. This variation in water quality, combined with the
hours of operation and duty cycle, will determine your own unique
maintenance schedule. Use the following maintenance schedules as
guidelines.
• Hard water (more than 12 gpg [more than 205 mg/L] hardness):
– Cleaning frequency determined by use and water quality; the
harder the water, the more cleaning required; inspect at least
every three months
– Regular skimming
– Regular drain and flush cycles; end-of season draining
• Naturally soft (2-12 gpg [35-205 mg/L] hardness) or softened
water:
– Annual cleaning
– Regular skimming
– Drain and flush cycles only as needed; end-of season draining
Softened water reduces maintenance
The easiest way to avoid maintenance in
a standard water system is to use water
with low levels of hardness. Keep in mind
that standard water systems require water
to have conductivity of at least 100 µS/cm
(2 gpg hardness) for the conductivity probe
to measure water levels accurately.
Also, most DRI-STEEM humidifiers have
adjustable skim durations. Increasing skim
time will often substitute for periodic drain
and flush sequences.
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