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

Fill to the 10 mL line with sample.

Use this to "blank" the instrument. Place in cell holder and press Blank.

Prepare sample by adding a Hardicol No1 tablet and crush and stir.

Then, add a Hardicol No2 tablet. Thoroughly crush and stir, until fully dissolved.

Place in the cell holder and press Measure.

Allow timer to count down 2 minutes. The result for Total Hardness will be displayed.