According to the German "International Journal of Health and Environmental Hygiene" reported that the British, Spanish and Dutch researchers in the long-term experiments found that stainless steel faucet in the surface aging will form a suitable Legionella growth environment, such bacteria will lead to various Veterans (a typical symptom of pneumonia) and other respiratory diseases.
Researchers in three years, respectively, from the stainless steel, brass and ceramic made of three kinds of faucet for the survival of Legionella were tested the degree of water, respectively, the water from the metal pipe and plastic conduit delivery. Prior to the scientists believe that metal pipes will produce rust molecules and then promote the propagation of Legionella. The experiment proved that the use of stainless steel faucet in the third year, due to the surface of the faucet corrosion-resistant stainless steel aging, the number of Legionella bacteria will grow rapidly. An average of half of the stainless steel faucets breed Legionella (the Netherlands is more typical), and only a quarter of brass and ceramic faucets breed Legionella, and use plastic pipes or metal conduits in nature and Does not affect the experimental results.
In addition, the study also pointed out that brass made of faucets is the most secure. But in fact, in recent years the demand for brass has gradually declined. There are two reasons, one is because the brass and bronze mixed high-quality faucet is expensive, the second is the producers to enter the market, cost savings, in the mixture to add silicon elements, which improves the faucet brittleness, but also shorten its life. While stainless steel faucets are cheaper, and brittle low, more in line with consumer demand.
Reported that Legionella will not only lead to veterans disease, but also lead to some difficult to be diagnosed with chronic diseases. For example, Pontiac fever, which is generally considered to be a common acute respiratory virus infection.