• Brand Name: Hach Company
  
• Model Number: 1194T51EA
  
• National Stock Number: 6630-01-507-9568
  
• Number of Items: 1
  
• Part Number: 2745250
  
• Product Dimensions (cm): 12.83 x 7.65 x 3.05

Calcium and magnesium ions are nearly exclusively responsible for water hardness. Other divalent and trivalent metals have a similar effect, but are rarely present in sufficient concentrations in drinkable water to create concerns. Hardness generates scale in boilers and increases soap use in laundries.