In freshwater, the main hardness causing ions are calcium and magnesium. Groundwater is generally harder than surface water. The taste threshould for the calcium ion in drinking water varies from 100 to 300 mg/litre, for magnesium ion the taste threshould is less. According to the related Notification of the Ministry of Public Health, the limit for hardness in bottled drinking water is 100 mg/litre. This test kit for hardness in water is developed to be used outside laboratoray. The result can be obtained in a few minutes with reliable accuracy.
Target Sample
Bottle drinking water, tap water, ground water, water from other sources.
