Hardness, Total
Photometric test for Total Hardness in natural water, treated water and drinking water
Colour Change
Colourless to Purple
Range:
0 - 500 mg/L CaCO₃
Technical Resource:
Total Hardness Test Method, Technical Information
Notes:

Strongly acidic or alkaline samples should be adjusted to within pH 4 to pH 10 prior to starting the test

01
Fill to the 10 mL line with sample.
02
Use this to "blank" the instrument. Place in cell holder and press Blank.
03
Prepare sample by adding a Hardicol No1 tablet and crush and stir.
04
Then, add a Hardicol No2 tablet. Thoroughly crush and stir, until fully dissolved.
05
Place in the cell holder and press Measure.
06
Allow timer to count down 2 minutes. The result for Total Hardness will be displayed.
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