Water hardness is caused almost entirely by calcium and magnesium ion. Other di- and trivalent metals have a similar effect, but usually are not present in high enough concentration in potable waters to cause problems. Hardness increases soap consumption in laundries and causes scale in boilers. With the Model 5-EP test kit, simply count the number of drops required to change the solution color to determine hardness concentration. Product DetailsManufacturer Part Number: 145400Manufacturer Part Number: 1454-00Manufacturer: Hach CompanyUsage: For Measuring Total Hardness in WaterApplications: Water TreatmentApplications: Water Testing Simple to Use OperationKit Contains 100 Reagents, Beaker, Solution and VialUtilizes Drop Count Titration with a Range of 1-30 gpg.Contains Approximately 100 TestsWith Carrying Rugged Carrying CaseCanada Delivery Information Hach 145400All Canadian Provinces - No Other CountryOntario, Quebec, Nova ScotiaAlberta, British Columbia, ManitobaNew Brunswick, Prince Edward IslandNunavut, Yukon & Northwest TerritoriesSaskatchewan, Newfoundland & Labrador