It seems that the water imported is classified into four by the kind and disposal method of raw water.
Natural water is the groundwater extracted from the head where raw water is specific, I am processed by filtration, precipitation, and heat pasteurization.
Raw water of natural mineral water is the groundwater which the mineral dissolved in underground, I am processed by filtration, precipitation, and heat pasteurization.
Raw water is the groundwater which the mineral dissolved in underground, and mineral water has some to which ozone sterilization, ultraviolet-rays sterilization, minerals adjustment, a blend of two or more raw water, etc. other than processing of filtration, precipitation, and heat pasteurization were given.
Bottled water is water in which drinks of raw water, such as distilled water, purity, front running water of a river, and tap water, are possible, and a disposal method in particular does not have regulation.
The imported water also has the classification by hardness.
I change hardness into the amount of calcium carbonate to the quantity of the calcium contained underwater and magnesium, and express it as what mg per liter. In accordance with calcium hardness and magnesium hardness, I call it all the 硬.
Hardness includes U.S. hardness and the German hardness. The calculation method differs from the display numerical value, respectively, and, generally the direction of U.S. hardness has spread.
In the guideline of the World Health Organization (WHO), I divide the water in the world into four classification at given hardness. If it is hard water of a degree, and 120-180 in the middle when it is 0-60 and is soft water, and 60-120 and will become hard water and 180 or more, I will become extraordinary hard water.
Most domestic mineral water is soft water, there is little quantity of the calcium and magnesium which melted underwater, and hard water with much quantity of the calcium and magnesium in which the mineral water of import melted underwater is almost the case.