Water Classification

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ITEM

Drinking water standard

Pure water standard

Other drinking water

Mineral water standard

Ultrapure water standard

Softened water

Demineralized water

Primary standard

Secondary standard

Low pressure steam boiler

Medium pressure steam   boiler

1

Chroma

≤15

≤5, and must not   present other colors

≤10

≤15, and must not present other colors





2

Turbidity

≤1

≤1

≤1

≤5



≤5

≤2

3

Stinky

odorless

No odor

NO

With the characteristic taste of this mineral   water, there must be no smell or smell



NO   smell


4

Visible substance

Must not contain

Not   checked out

Allow a very small amount of natural mineral   salt to sink to the bottom, but must not contain other foreign matter



≤5mg/L


5

Total hardness   (calcium carbonate)

450mg/L






≤0.03mmol/L

≈0

6

Pb

0.01mg/L

≤0.01mg/L


≤0.010mg/L

0.5ug/L

5ug/L



7

As

0.01mg/L



≤0.01mg/L





8

Hg

0.001mg/L



≤0.0010mg/L





9

Cd

0.005mg/L



≤0.003mg/L





10

Ag

0.05mg/L



≤0.050mg/L





11

Fe

0.3mg/L




0.5ug/L

5ug/L

≤0.3mg/L

≤50ug/L

12

Mn

0.1mg/L

≤0.1mg/L






≤10ug/L

13

Cu

1.0mg/L

≤1mg/L


≤1.0mg/L

0.2ug/L

2ug/L



14

Zn

1.0mg/L



≤0.20mg/L

0.2ug/L

2ug/L



15

Mg





0.2ug/L

1ug/L



16

Ca





0.5ug/L

5ug/L



17

Na





0.5ug/L

6ug/L



18

bromide




≥1.0mg/L





19

iodide




≥0.20mg/L





20

Organics(COD)





0.3ug/L

0.5ug/L



21

SiO2





2ug/L

20ug/L



22

volatile phenol

(phenol)

0.002mg/L

≤0.002mg/L


≤0.002mg/L





23

Metasilicic acid




≥25mg/L,   (when the content is in the range of 25.0-30.0mg/L, the water temperature   must be above 25°C)





24

Dissolved solid

1000mg/L



≥1000mg/L



≤350

≤350

25

Fluoride

1.0mg/L



≤1.5mg/L





26

Cyanide

0.05mg/L

≤0.002mg/L


≤0.010mg/L





27

Nitrate (based on   nitrogen)

≤10mg/L

≤0.002mg/L


≤45.0mg/L





28

Volatile


≤0.002mg/L







29

Free chlorine

0.3mg/L

≤0.005mg/L

≤0.05mg/L





0.2

30

Carbon nitrite


≤0.002mg/L







31

PH value

6.5-8.5

≤5.0-7.0



6.8-7.2

6.6-7.4

7-9

8-9.5

32

Conductivity μs/cm


≤10



0.05

0.1


≤80

33

Resistivity (25℃)   MΩ.com

5μg/L




≥17-18

≥12-15



34

Total number of   colonies

≤100cfu/mL

≤20cfu/mL


Source   water: <50cfu/mL

Filling   product: 50cfu/mL

1pcs ug/L

5pcs ug/L



35

E.coli

Not   checked out

Not   checked out

Not   checked out

0





36

Pathogenic bacteria

Not   checked out

Not   checked out

Not   checked out

Not checked out





37

Mold, yeast


Not   checked out

Not   checked out






38

Total βradioactivity

1.0βg/L








 

1.Tap water: it general comes from rivers, lakes or underground water, after being filtered and sterilized then pumped to the pipe network. In addition to turbidity, chemical oxygen demand and bacteria,nothing has been changed or improved.

2.Mineral water: the mineral water is unpolluted water which springs from the deep underground naturally or unexposed by human beings. It contains a certain amount of mineral salts, trace elements or carbon dioxide gas. Under normal circumstances, its chemical composition. flow amount, water temperature and so on are relatively stable in the range of natural fluctuation.

3.Mountain spring water: it is water got from about 100 meters of the underground with no pollution. Generally, it is treated by ultra-filtration system. The biggest advantage of the water is that it not only maintains the nutritional contents of the water, but also wipes off the impurities such as bacteria, organic matter.

4.Packaged drinking water: Sealed in food safety qualified packaging containers for direct drinking.

5.Purified water: it is the clean water with no impurities by using high rate desalination water treatment equipment. Conductivity is general 10-0.1 μs/cm. Mimicking the infiltration phenomenon of nutrients and excreta transporting process in the human body cellular, the reverse osmosis water purification machines separate the materials dissolved in the water through reverse osmosis membrane. The water becomes pure and clean after filtring. Although the RO membrane is also a kind of filter, its internal organization is very fine, the water only can pass it in the state of molecules, Therefore, not only the heavy metals, but even very tiny bacteria can also be filtered completely.

6.Pure water: the conductivity is in the range of about 50-100μs/cm, the indicator of bacterial is the same with the requirements of purified water. Generally, it adopts the imported Nanofilrtation membrane treatment and its rate of desalination is about 80%.At present, there is no national standard, but some local standards have come out.

7.Softened water: it is the water whose hardness(mainly refers to the calcium and magnesium in the water)has been removed or reduced to a certain degree. In the water softening process, only the hardness reduces, and the total sale content is unchanged.

8.Ultra-pure water: it is the water whose electrolyte is almost removed, at the same time it can remove or reduce the unrecompensed gas, colloid and matter organic etc to a very low level. Its electrical conductivity is generally 0.1-0.55μs/cm, and resistivity is(25℃)1.0X106Ω·cm,Salt content is 0.1 mg/L, the conductivity of ideal pure water(in theory)is 0.05 s/cm, and resistivity is(25℃ 18.3X106Ω·cm).

9.Mineralized water: it refers to join the useful minerals into the clean water. We need to point out it specially. First, the water should be the clean water after a rigorous treatment, because the impurities in water sometimes may react with the minerals to produce other substances. Second, minerals must undergo a rigorous selection and pass the special processes, such as high-temperature distillation, decarbonization, thus can be used.

10.Demineralized water: it refers to the water whose salt(mainly water-soluble strong electrolyte)is removed or reduced to a certain degree. Its electrical conductivity is generally 1.0-10μs/cm, electrical Resistivity(25℃)is 0.1-1.0x106Ω·cm,and the salt content is 1-2mg/L.

11.Magnetized water: it uses the effect of the magnetic field to treat water, which is called magnetic treatment of water.

12.Distilled water: vaporize the water through specific distillation equipment, and then collect the water through condensation and liquefaction. This drinking water is called distilled water.

13.The other: which is suitable for treating certain patients,such as alkaline water(PH value is about 8.5),ion water, oxygen-rich water(the oxygen of this water is more than normal drink),the return-nature water, health care water etc.

With the continuous improvement of people's living standards and the further development of the market, more types of drinking water will be expected to come out.

 

 

Ultrapure water standard

Softened water

Demineralized water

Primary standard

Secondary standard

Low pressure steam boiler

Medium pressure steam boiler

 

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