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What is soft water
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What is soft water

Views: 7     Author: Site Editor     Publish Time: 2022-08-12      Origin: Site


In our daily life, we often see that the inner wall of the kettle will have limescale after using it for a long time. What is the reason for this? It turns out that the water we take contains many inorganic salts, such as calcium and magnesium salts. These salts in the water at room temperature can not be found with the naked eye, once they are heated and boiled, there will be a lot of calcium and magnesium salts to carbonate formation precipitation out, they are close to the wall of the pot on the formation of scale. We usually use the content of calcium and magnesium ions in water as the indicator of "hardness" to express.

The hardness or softness of water depends on the mineral content of calcium and magnesium.

  • The content of soft water is less than 17 parts per million

  • Slightly hard water has a content of 17 to 60 parts per million

  • 60 to 120 parts per million for moderately hard water

  • 120 to 180 parts per million for hard water

  • Very hard water more than 180 parts per million

The difference between softened water and hard water

The difference between softened water and other water

Raw water, is the water that has not been treated. In a broad sense, for the water before entering the water treatment process is also called the original water for the water treatment. For example, the water sent to the clarifier from the water source is called raw water.


Softened water, is the water hardness (mainly refers to the water calcium, magnesium ions) to remove or reduce a certain degree of water. Water in the process of softening, only the hardness is reduced, and the total salt content remains unchanged.


Desalinated water, refers to the water salts (mainly strong electrolytes dissolved in water) to remove or reduce to a certain extent the water. Its electrical conductivity is generally 1.0 ~ 10.0µS/cm, resistivity (25 ℃) (0.1 ~ 1.0) × 106Ω-cm, salt content of 1 ~ 5mg / L.

Learn more about how to get desalinated water?


Pure water, refers to the strong electrolytes and weak electrolytes (such as SiO2, CO2, etc.) in the water, removed or reduced to a certain degree of water. Its conductivity is generally: 1.0~0.1µS/cm, conductivity (1.01.0~10.0) × 106Ω-cm . The salt content is <1mg/L.

Learn more about how to get pure water?


Ultra-pure water, refers to the water conductive medium almost completely removed, while not dissociated gases, colloids and organic substances (including bacteria, etc.) also removed to a very low degree of water. Its conductivity is generally 0.1~0.055µS/cm, resistivity (25℃) >10×106Ω-cm, salt content <0.1 mg/L. The ideal pure water (theoretically) has a conductivity of 0.05µS/cm and resistivity (25℃) of 18.3×106Ω-cm.

Learn more about how to get ultrapure water?

Water Softener

How to treat hard water?

If you are concerned that your water is too hard, there are a variety of water softening equipment options to obtain soft water.

Ion exchange resins. This technology uses a physical and chemical process to filter your water through resins or zeolites. The positively charged sodium ions attract calcium and magnesium, removing them from the water.

Ion exchange resin



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