1. The molecular formula of water is H2O, with a relative molecular weight of 18.015. In the molecular structure of water, hydrogen accounts for 11.9% and oxygen accounts for 88.81%.

2. The salt content of water: also known as mineralization degree, indicates the total number of salts in the water, and can also indicate the sum of various anions and cations in the water.

3. Intensity: The total concentration of metal ions in water after the fusion of cation and cation to produce dirt.

4. Oxidation-reduction potential and resistor: The purer the water, the lower the salt content, the higher the resistivity, and the lower the oxidation-reduction potential value. Ultra pure water basically cannot conduct electricity. The size of the oxidation-reduction potential is equivalent to the lower value of the resistance.

5. PH value and pH value: The pH value of water is a negative logarithmic value indicating the concentration of hydroxide ions in the water, also known as the hydroxide ion index value. Be able to understand whether the solution is alkaline, neutral, and acid-base.

6. High quality water: On the basis of municipal engineering power supply (or qualified water), process flows such as coarse filtration, fine filtration, ultrafiltration membrane, and sterilization are selected. High quality domestic water obtained through production and processing.

7. Purified water: a precious water source in nature, which has undergone simple disinfection and filtration before being supplied as a product for daily use to numerous customers.

8. Mineral water: Clean water obtained by using water purification equipment with a high desalination rate and basically without any residue, with a conductivity generally ranging from 1.0 to 0.1 μ S/cm,

9. Acidified water: Pure acidified water with nutrients obtained by using unique processing techniques and adding mineral layers to relatively pure raw water.

10. Softening water treatment: refers to the removal or reduction of a certain level of water in terms of strength (especially calcium and aluminum ions). During the entire process of softening, water only decreases in strength, while the total salt content does not change.

11. Desalinated water: refers to water in which salts (mainly strong electrolytes of dissolved water) are removed or reduced to a certain level. 1.0-10.0 μ S/cm, resistivity (25 ℃) 0.1-1.0 * 106cm, salt content 1-5mg/L

12. Pure water: refers to the hydrolysis of strong electrolytes and salts (such as SiO2, CO2, etc.) in water to remove or reduce it to a certain level of water. Its conductivity is generally between 1.0 and 0.1 μ S/cm, resistivity 1.0-10.0 * 106 Ω· cm. Salt content<1mg/L.

13. Ultra pure water: refers to water in which the electrolytic medium is basically completely removed, and at the same time, insoluble vapors, colloidal solutions, and organic chemical substances (including bacteria, etc.) are also removed to a very low level of water. Its conductivity is generally between 0.1 and 0.55 μ S/cm, resistivity (25 ℃) 10.0 * 106 Ω· cm. Salt content<0.1mg/L. Idealized pure water (theoretically) with a conductivity of 0.05 μ S/cm, resistivity (25 ℃) 18.3 * 106 Ω? Cm.

14. Surface water: It is the water produced by the infiltration and fluidity of precipitation through soil layers and geological structures. In its long process and common contact, it incorporates a lot of salts and has extremely high intensity. However, at the same time, surface water undergoes layer by layer filtration, with very few suspended solids, clear water, and low turbidity.

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