Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 6 – MAINTENANCE
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90
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AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0078_0M
09/11/2015
Phone: 800-526-0288
GF-128
Calcium Carbonate Spot Test
A calcium carbonate spot test is performed by exposing a form of calcium carbonate to the
HydroSkrub solution. Samples of the deposit, a Tums or Rolaids tablet, or bare concrete
can be used. Observe the reaction of the HydroSkrub solution on the calcium carbonate.
Foaming and bubbling indicates the solution is still active. Little or no reaction indicates that
the solution is expended. This test should be performed near the end of the circulating time.
If the solution has been expended, more HydroSkrub will be required to complete the job. If
the solution is still active at the end of the time, all the scale has been dissolved.
pH Trend Charting
The initial pH of the cleaning solution will measure between 1-3 (See pH sheet on
HydroSkrub packaging). To test the effectiveness of the circulating solution as a function of
pH, take readings at regular intervals and chart as a trend. Note that the deposits can
cause a premature jump in the pH. After circulating for approximately 75% of the cycle time,
begin testing the pH at 10-15 minute intervals. Once the solution’s pH reads 6.0-7.0 on
three or more consecutive readings, the solution is expended. If the pH reads below 6.0
after the circulating time, the application is clean.
