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1 Filter sample if necessary to obtain a clear solution.
2 Fill the test tube with sample to the 10 ml mark.
3 Add one Calcicol No 1 tablet, crush and mix to dissolve.
4 Add one Calcicol No 2 tablet, crush and mix to dissolve.
5 Stand for two minutes to allow full colour development.
6 Select Phot 12 on the Photometer for result as mg/l CaCO3, or Phot 60 for
result as mg/l Ca.
7 Take Photometer reading in the usual manner (see Photometer instructions).