Look: Use a glass with high transparency to be filled with a cup of water, and look at the light to see if there is a fine substance suspended in the water? Let it sit for three hours, and then observe the bottom of the cup whether there is sediment? If there is, that the water suspended impurities seriously exceed the standard; must use a water purifier for terminal treatment;
2. Smell: glass from the faucet as far away as possible to receive a cup of water, and then smell with the nose, whether there is bleach (chlorine) flavor? If you can smell the bleach (chlorine) flavor, indicating that the residual chlorine in the tap water exceeds the standard! Must also use a water purifier for terminal treatment;
3. Taste: hot drinking water, there is no bleach (chlorine) flavor, if you can smell the bleach (chlorine) flavor, indicating that the residual chlorine in the tap water exceeds the standard! Must also use a water purifier for terminal treatment;
Teach you a simple way to detect the home of the water quality is good or bad? 4. View: tea with tap water, overnight observation of tea is black? If the tea becomes black, the tap water containing iron, manganese, serious overload, should be equipped with iron, manganese filter for the terminal treatment of water purifiers;
5. taste: taste the water, the taste of astringent feeling? If there is, that the water hardness is too high, should be equipped with ion exchange resin softening cartridge water purifier for treatment, after the treatment of water taste will be sweeter;
6. check: check the home water heater, kettle, the inner wall of a layer of yellow scale? If so, it also shows that the water hardness is too high, (calcium, magnesium salt content is too high), should also be used as soon as possible to soften the water purifier for softening treatment! Note: the high hardness of the water is very easy to cause the water heater pipe scaling, due to poor heat exchange and burst pipe; long-term consumption of high hardness of water is easy to make people get a variety of stone disease.
Home tap water quality to see which places?
Purification of home first and everyone to see what the indicators to detect the quality of tap water. China's water quality indicators on drinking water a **** as many as 106, can be roughly divided into four categories:
(1) physical indicators: smell, temperature, turbidity, transparency, color, etc.;
(2) chemical indicators: conductivity, pH, hardness, alkalinity, toxic metals, toxic quasi-metals, nitrates, nitrites, phosphates, etc.;
(3 ) Biological indicators: total bacteria, coliforms, algae, etc.;
(4) Radioactive indicators: total alpha rays, total beta rays, uranium, radium, thorium, etc.
Since most domestic tap water treatment plants only have about 10-20 items of water quality treatment, tap water quality is more dependent on the condition of the water source. Even the imperial capital of Beijing, the best domestic tap water treatment is not up to the standard of drinking water, the 08 Beijing Olympic Games when the swimming pool water is still separate activated carbon filtration, ozone sterilization and other treatments to meet the standards.
The above four major classifications, radioactive indicators we can not test at home. Biological indicators as long as we make sure to drink boiled tap water will not be a problem. As for physical and chemical indicators, here is the focus.
1, tap water quality testing of physical indicators:
Qualified tap water should be colorless and tasteless; tap water poured in a transparent glass cup, facing the light source to carefully check the water whether there are impurities or flocs, whether the color is clear. The cup will be left to stand for three hours, observe the bottom of the cup whether there are sediments appear. If so, the tap water physical indicators failed.
The TDS water test pen is not able to detect the water quality, TDS value on behalf of the water content of dissolved impurities, the good and bad of the tap water is no reference.
TDS water test pen is more used to test the filtration effect of home water purifier, because the water purifier impurities in the water, including some minerals, metal ions and other harmless substances will also block, will significantly reduce the content of impurities in the water.
2, tap water quality testing of chemical indicators:
Tap water chemical indicators, and the relationship between the most recent is the hardness of water, water hardness is the concentration of calcium and magnesium ions contained in the water. The higher the concentration of calcium and magnesium ions, the greater the hardness of the water, the more astringent taste, the more likely to generate limescale and tea scale. The specific value of water hardness can be tested by EDTA standard solution, we are at home the simplest way is to boil the water to remove the calcium and magnesium ions in the hard water, soften the water quality. Of course, there are reverse osmosis function of the water purifier effect is better.
Water electrolyzer (solid precipitation promoter) on tap water quality testing is not scientific. Because the tap water metal ions in the water is bound to be more than mineral water or pure water, stronger conductivity is more conducive to the electrolyzer's own metal rod on the precipitation of iron to form reddish-brown impurities. The reddish-brown impurities here are the result of the oxidation of iron on the electrolyzer's own iron rods, not the precipitation of iron in the water, so it can't explain the problem.
Tap water quality is usually worse than pure water and mineral water, but the water electrolyzer can only show that the tap water conductivity is better, metal ions (both metal ions beneficial to the human body also contains metal ions that are not beneficial to the human body) more.
In fact, the tap water chemical indicators test, the easiest way is to smell the odor, the smell of bleach. The second is to leave the tap water for a day to see if it can support small fish.