Section 7
Specifications
72183227
8-2016/Rev 01
ORIGINAL INSTRUCTIONS
7-5
Table 11-2
Water Impurities
Constituent
Chemical Formula
Comments
Sulfate
SO
4
Adds to solid content; combines with calcium to
form calcium sulfate scale.
TDS
Measure of the total amount of dissolved matter
in water.
Total Hardness
CaCO
3
Sum of all hardness constituents in water;
typically expressed as their equivalent
concentration of calcium carbonate; primarily due
to calcium and magnesium in solution, but may
include small amounts of metal. Carbonate
hardness is usually due to magnesium and
calcium bicarbonate; non-carbonate hardness is
due to sulfates and chlorides.
pH
Intensity of the acidic or alkaline solids in water;
pH scale runs from 0, highly acidic, to 14, highly
alkaline; with 7 being neutral.
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