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Test Procedure 1 Select the sample size appropriate to the calcium hardness range under test. Take a sample of the correct size in the sample container. 2 Add one Calcium Hardness tablet and shake the container until the tablet disintegrates. 3 Continue adding tablets one at a time in this manner until the colour of the solution changes from pink to violet. 4 Note the number of tablets used and calculate the result from the formula below appropriate to the sample volume taken.
Sample Size = 50ml
Calculation = no of tablets x 40 minus 20 = Calcium Hardness