Reverse osmosis membrane use effect is good or not, with numerical value to speak

Accompanied by the chances of water pollution occurs, water treatment equipment in everyone's mind, the position of the higher and higher, gradually stepped into everyone's family, test the water body TDS pen is also followed by a hot sale on the Internet. However, water treatment equipment found that many users are sold on the Internet. TDS value is not very clear, but also confused: “What is the TDS value of drinking water”, “What is the normal value of drinking water TDS?” These. That way, that way,, these. can the TDS use value really turn out to be an important factor for customers to get hold of their water bodies and shop for water treatment equipment? Using water treatment equipment to you, the TDS value is the total yield of conductive substances in water.

TDS it refers to the total melting substance concentration value in the water, the key embodies the calcium, magnesium, potassium and other ions in the water concentration value and water strength and resistivity interrelationship. Its measurement principle is relatively simple, it refers to the purity of water through the resistor equivalent alternative method, due to pure water is insulating, natural water contains carbonates and organic compounds, into an electrical conductor, when the greater the impurities in the water, the greater the conductivity.

First, the TDS value does not reflect the merits of the water body

China's vast territory, some places have unique bodies of water, drinking water norms are not the same, in line with the requirements of the plant harmless to human health drinking water, some of the TDS more than a thousand, some places are likely not on the dozens. Water treatment equipment friendly reminder, TDS only accurate measurement of the amount of electrical conductivity in the water, can not accurately measure the water bacteria, germs and other harmful substances.

Secondly, TDS water hardness value can not be measured accurately.

Water treatment equipment is generally known as water soft and hard moderate, mainly by the calcium and magnesium positive ion content, and water treatment equipment is generally determined by the calcium and magnesium positive ion content TDS value is the embodiment of the water calcium, magnesium, sodium, calcium ions and carbonic acid positive ions, bicarbonate positive ions, chloride ions, hydrochloric acid positive ion and sodium cyanide ions in the total content of water, the two are too big a difference.

Once again, TDS water pH acidity and alkalinity

Water quality acidity and alkalinity from the water PH value to determine, that is, the concentration of hydrogen ions in the water is too small, but also with the concentration of hydrogen ions in the water about the TDS value is proportional.

Ultimately, the TDS value can not be all water purifier filtration quality indicators

TDS value generally only reflects the water treatment equipment is not to achieve the actual effect of overconsideration, conductive minerals and positive ions in the water can be passed, and therefore the TDS drinking water quality as well as the filtration accuracy of the water purifier can not simply mean.

Softened water and water hardness

Water for softened water, water hardness, no or with a little calcium, aluminum ions water is called softened water, otherwise known as water hardness. If the water hardness component is caused by calcium carbonate or magnesium bicarbonate, it is temporary water hardness (boiling temporary water hardness, dissolved calcium carbonate, insoluble sulfide deposits, water hardness into softened water); if it is caused by calcium, magnesium potassium thiocyanate or fluoride, it is permanent water hardness. According to the total hardness value of water, the total hardness of 0-30ppm total strength total hardness of 60ppm above the water hardness, high quality water for domestic use shall not exceed 25ppm, high quality softened water total hardness of 10ppm below.

Water conductivity . Is there a relationship between strength and TDS?
On the daily work of purifying water, people always ask, water TDS is water hardness? Some even immediately put him into the TDS is more critical, it is called strength TDS look at the resistivity, these, to name a few. At this level, frankly speaking, there are really too many “water illiterates”!
In this case, let's take another look at “Water Science” from a scientific perspective. A more professional spirituality. Pragmatic mentality of freshwater TDS, resistivity and strength of this concept and the correlation between the two and the difference.
TDS can reflect the water body to a certain extent good, and resistivity has a positive correlation
TDS is the English Totaldissolvedsolids abbreviation, the Chinese translation for total dissolved solids, also known as total salinity. Measured in mg/liter, or mg/liter, or mg/L, it indicates how many milligrams of total dissolved solids are melted in 1 liter of water, or the total positive ion production in 1 liter of water.
DS can also be expressed in this formula:
TDS = [Ca+Mg+Na+K] + [HCO3+SO4+Cl].

Because of water supersolubility, water contains chlorite . Colloidal solutions . Particulate contaminants . Proteins . Viral infections . Disease organisms . Microbial strains, remains and relatively small metal ions. As we all know, the melted solids in mineral water are very small, usually only zero to tens of mg/liter up and down.
If the water source is contaminated or melted a variety of soluble chemicals, its total solids content with the increase of soluble substances to enhance.
Water treatment equipment water TDS test
TDS definition is imported goods in the United States . Widely used in Taiwan's wastewater treatment industry, TDS is generally measured using a value measuring instrument, the TDS pen, which can accurately measure the total yield of various types of organic compounds and inorganic compounds in molten water. The principle of measurement is in fact by the accurate measurement of pure water conductivity indirectly reflects the TDS value. In the physical sense, the greater the dissolved matter in the water, the more water is also the more TDS value, the better the water conductivity, the more resistivity. Another fashionable saying is: TDS the value means that the water dissolved matter impurity components, the more TDS value, the more impurity components in the water, the opposite is also true.
1. Hazardous TDS value test three elements
1) water temperature: TDS pen can not be used to accurately measure the sustained high temperature water quality, such as boiling water. Water temperature should be maintained at 25 ℃ up and down, remember, too high ambient temperature will make the temperature is too high will make sustained high-temperature water quality, such as boiling water. tds growth value will affect the accuracy. 2) water flow rate: tds pen can not be used to accurately measure the water quality of the relatively large shaking. 3) water pollution: tds pen can not be used to accurately measure the pollution concentration of relatively high water quality.
For example, Beijing's drinking water average value of 250ppm above and below, RO reverse osmosis water purification TDS value purification treatment to 25ppm below (measured by the conductivity of 90% of the membrane water), when the value exceeds 30% ppm this time, must consider removing and replacing the RO filter paper or looking for a professional staff to check to determine whether to change the cartridge.

2.TDS accurate measurement of water quality problems and blind spots
TDS pen is not the only one, the defects of its application blind spot is very obvious: 1) TDS conductive chemicals in the water only accurate measurement, but the germs can not be measured accurately. Germs and other microbial strains of pollutants; 2) the positive ions in the water is not all harmful, and thus can not be completely dependent on the TDS water body is just a standard value; 3) independent dependence on the TDS to distinguish whether the water body can be raw drinking is not the most correct way. Some pollutants are even more in need of precise instrumentation to measure them accurately.

Naturally, TDS pen or other similar instruments and equipment labeled pen TDS value means resistivity, means resistivity, means resistivity TDS its practical significance indirectly embodies a certain type of water in the melting solid content, the human body is also very important to drink healthy.
2. Can not be completely with the help of resistivity to determine the TDS value how much
Conductivity: water conductivity is the last of the water resistance, generally used to indicate the purity of water. The more conductivity, the higher the conductivity, and vice versa.
Water treatment equipment and water resistivity detector
Just be able to probably cause TDS may resistivity. TDS actually just refers to the general dissolved solids in the water quality, that is, the sum of positive ions. But not the same ion conductivity is not the same, so even in the same positive ions, TDS because the water quality of the positive ion composition is not the same, resistivity is not the same.
There is an empirical formula law, that is, TDS is equivalent to resistivity multiplied by 0.5-0.7.

iii. Strength only refers to the chlorite component, water hardness for life and production of the community is more harmful
Water hardness is the water calcium. Aluminum ion concentration value, hardness unit is ppm, 1 ppm on behalf of the water calcium bicarbonate composition of 1mg / liter, that is, mg / L.
Further to the first part of the understanding, water hardness and water hardness TDS is completely two different things, can not be confused. The former strength refers only to the water calcium. Aluminum ion concentration value, the latter kind of TDS refers to the total production of soluble solids in water, including organic compounds. Inorganic compounds, the topic is clear!
1. Soft water and hard water, and its transient water hardness and permanent water hardness this concept
Water hardness testing and comparison of water treatment equipment
Water for softened water. Water hardness without or with a little calcium. Aluminum ion water is called softened water, the opposite is also.
If the water hardness component is composed of bicarbonate or magnesium bicarbonate, it is transient water hardness. Because of the sodium bicarbonate dissolved in boiling water and insoluble sulfide deposits, the water becomes softened with water hardness. It may contain calcium, magnesium, potassium thiocyanate or fluoride. Magnesium potassium thiocyanate or fluoride is permanent water hardness, heating does not deposit.
2. Water hardness is divided into four levels
1)Softened water:0-60ppm;2)Slight water hardness:60-120ppm;3)Water hardness:120-180ppm;4)Extreme water hardness:181ppm above.


In the natural water, away from the hustle and bustle of precipitation without environmental pollution. Snow belongs to the softened water; mountain spring water. Streams. River water. Reservoir water, mostly transient water hardness, mostly high hardness water.
3. Water hardness on the equipment and life of the three major injuries
The first major harm: with the soap reaction caused by insoluble deposits, the decline in the actual effect of cleaning. As a result, the major brands to the water softener to soften the soap and the direct use of water hardness hand sanitizing the significant difference between the cleaning of the actual effect is not the same.
The second major harm:In industry, calcium, salt, magnesium, salt deposition will lead to pot scale, blocking heat conduction, serious cases will cause boiler explosion. Considering the water hardness conundrum, because of the machine, every year in industry . It costs tens of millions of dollars to maintain and remove and replace piping.
Dirt and water hardness are critical to purifying and treating the destruction of everyday household items and distribution equipment
The third major harm:Drinking water hardness will also have a certain amount of harm to health and daily life. Don't often drink water hardness people sometimes drink water hardness, will also cause gastrointestinal function obstacles, that is, we often say “water and soil conditions”; with hard water cooking fish fillets. Vegetables and fruits will damage or reduce the nutritional value of food, because it is not easy to boil; hard water to cook tea can change the color of tea and drink with the use of value; hard water to do not only reduce the production of tofu. Harm the nutritional composition of tofu.
4. Water hardness after heating will have 11 big damage
When water hardness heating, will precipitate calcium carbonate and calcium sulfate, due to calcium bicarbonate calcium will precipitate calcium carbonate and calcium sulfate. Calcium sulfate is difficult to dissolve in water, so the impact on a healthy lifestyle is shown below:
1) mirror glass paved with water stains; 2) cotton clothes or cotton towels muscle stiffness not puffy, several times after washing dull tone; 3) electric water heater . Humidifier and other facilities drain clogged . Total flow is reduced. Shorten the life; 4) cream-colored bathtubs or restrooms and other facilities yellowing; 5) tap. Spray nozzles stuffed with dirt. Mold. Stainless steel surface water stains discoloration; 6) dry skin after bathing. Not smooth. Itchy; 7) dry hair. Tie knot is not easy to organize, you can use a special type of shampoo; 8) water yellowing rust; 9) the establishment of pot scale limits the heat conduction of the electric heater. When the pot scale is too thick, it will make the heater partially overheating, leading to the heater cracking and safety accidents, and sometimes cause the boiler to explode; 10) filled with the pungent smell of disinfectant; 11) made from the cloudy color of the ice cubes, and no crystal clear feeling, poor taste.

Well, science so much, finally summarized: symptomatic treatment, if you use drinking water, TDS is also higher, water hardness is also higher. Scientific and reasonable solution to be assembled in the drinking water end with epoxy resin ion exchange method functional water softener, soften the water treatment in the chlorite. The most important thing is to install RO reverse osmosis water treatment equipment at the domestic water and cooking end, which completely cleans and purifies the treated water (including colloidal solution). Fine sand. Disease germs. Heavy metals and other environmental pollution harmful substances), in order to obtain reliable mineral water.