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1.Rinse stoppered bottle three times in sample water.
2.Fill bottle to 50ml mark.
3.Remove one alkalinity test tablet from its container or foil wrapper taking care not to touch it with your fingers. Place in bottle and shake until it has dissolved.
4.Check the colour. Has it turned bright pink and remained pink? If not repeat 3 until it has.
5.Multiply the number of tablets used by 40 and subtract 20.
6.The result is the Alkalinity.