Hard water contains dissolved mineral salts – like calcium and magnesium. These minerals can interfere with a detergent’s ability to clean – which is why you may need to use more detergent if your water is hard.
Check it out! You probably have hard water if:
• You suffer from ring around the water storage tanks.
• Soaps and detergents do not lather easily.
• There is white residue around your faucets, boiling pans and drains.
Hardness is caused by
Quantity of above in water decides the degree of hardness. Water is soft up to 40 mg/L, moderately hard up to 120 mg/L and hard above 120 mg/L of calcium hardness. If hardness is more than 40 mg/L, water softener should be used Since water hardness varies from city to city, the easiest way to know if you have it is to call your local water testing lab and have water tested.
Different units of water hardness are: