f3922471_ater_Standards_and_Definitions__AGENT
[SOURCES] Based on the amount of dissolved calcium and magnesium present in water [EFFECTS] Can create scales in cold water piping Heated hard water can build up in water heaters, boilers, and other appliances; and can boosts heating bills by as much as 20% Unsightly film or scum in tub & other fixtures; usage of more soap is required to clean; Build up on skin & hair; can cause dry skin, brittle hair, skin irritation & clogged pores Graying of whites or loss of brightness in colored laundry; can cut back life cycle of clothing by 35% Calcium & Magnesium will be absorbed by foods cooked in water & foods are more likely to shrink & become tough [AGENT] 
Hardness
Haskell Water Treatment Drinking Water Standards and Definitions
AGENT