DRI-STEEM Humidifier De-scaling Solution and Neutralizer Usage Instructions • Page 5
18. Allow the solution to dissolve scale while checking on the progress
every 2 hours up to a maximum of 8 hours. For increased
performance, continue agitation throughout the de-scaling process
and maintain a pH close to 2.
19. De-scaling is complete when the majority of scale has been
dissolved or after 8 hours has passed.
20. After de-scaling is complete, dilute the solution to a pH between
5 and 9. This can be accomplished by either manually filling the
humidifier while allowing diluted solution through the overflow
port, or by adding Humidifier De-scaling Neutralizer (see
instructions below).
CAUTION! Do not leave humidifier unattended while diluting or
neutralizing to avoid spills or overflowing.
21. For neutralization use the following steps:
a. Measure the pH of the solution in the humidifier tank.
b. Measure out 1 lb of Humidifier De-scaling Neutralizer per
1 gallon of Humidifier De-scaling Solution used (see the table
on the last page of this document for reference).
c. SLOWLY, add the Humidifier De-scaling Neutralizer to
the humidifier while monitoring the level of solution in the
humidifier.
CAUTION! The combination of the two chemicals will cause
bubbling and release of carbon dioxide. If the neutralizer is
added too quickly, the humidifier can overflow.
d. Alternately, agitate the solution to ensure proper mixing.
e. Once the neutralizer has been added and bubbling has stopped,
measure the pH. Neutralized pH should be between 6 and 8.
f. If pH is not between 6 and 8, add acid (De-Scaling Solution)
to lower pH, or add base (De-Scaling Neutralizer) to raise pH
until pH is in the range of 6 to 8.
22. After dilution has been completed, drain the humidifier while
abiding by federal, state, and local codes.
23. Rinse the humidifier thoroughly by refilling and draining until
humidifier water pH matches pH of incoming water (typically
pH 6-8).
24. If significant scale remains, remove manually or repeat the
cleaning process. Note that some residual scale may remain.
25. After cleaning is complete and humidifier properly rinsed,
re-install probe assembly and return humidifier to service.
U s a g e i n s t r u c t i o n s
Overflow port
Drain valve
Figure 5-1:
Typical overflow port, drain locations
STS humidifier
OM-938M
Measuring pH
Measure pH by using a pH meter and probe,
or by using pH paper strips with a color key
(provided with De-scaling Solution).
If using a pH meter and probe, follow the
instructions that came with your pH meter and
probe.
If using pH paper strips, insert a strip into the
tank water and remove. Compare the color of the
strip to the color key to determine pH.
(36 pages)
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