The hot news on the Internet said, "The water supply company strongly appeals to the general public not to put the blue toilet block into the water tank of their own toilets, which will harm others and themselves. Toilet cleaning blocks are only suitable for buildings with different water supply systems abroad, but there is almost no such water supply system in China. Because there is no one-way check valve in the main valve and the sub-valve, under the negative pressure, the polluted water with strong carcinogenicity and pathogenicity will flow back to the water supply system, causing cancer, leukemia and so on.
20 15 Life Times interviewed relevant experts on this statement and reported on the topic "The Truth of Cancer Caused by Toilet Cleaning Block". Our reporter interviewed Liang Li, spokesperson of Beijing Water Supply Group, and Li and Liang Li, associate researchers of Tianjin Institute of Medicine. They said that the toilet tanks used in residents' toilets are filled with water. When water supply is stopped or users concentrate a lot of water, the pressure in the tap water pipe drops. At this time, if the water inlet valve in the toilet tank is damaged or the rubber ring at the water inlet is not tightly sealed, blue water will flow back into the tap water pipe. This only happens occasionally. Under normal circumstances, the water in the toilet tank will not flow into the water supply pipe. If you are worried about the backflow of the toilet water tank at home, you can change the water inlet mode of the water tank to the upper water inlet; If it is found that the tap water discharged from home is blue, it can be discharged by discharging water. Under normal circumstances, the amount of water in the toilet tank is not very large, and it can be used after the color of the water is restored to normal by discharging water.
At the same time, Liang Li also pointed out that the water used for flushing toilets in some communities is "reclaimed water" (that is, non-potable water that has been treated by urban sewage or domestic sewage to reach a certain water quality standard and reused within a certain range), which is separate from the tap water pipeline. Therefore, there is no possibility of sewage backflow polluting drinking water in the toilet tank of such families, so don't worry.
Regarding the problem of "toilet clogging causes cancer", Li said that there is still no exact research data, and its toxic effect on human body is related to dose, so it is not necessary to be too nervous.
The main components of toilet cleaner are surfactants or adhesives such as alkyl sulfonate and polyvinyl alcohol, which are often used in cleaning products such as soap and belong to external use. If ingested for a long time, it may cause chronic poisoning. It is suggested that families with single water supply system should try not to put toilet cleaning blocks in the water tank, and can choose bottled toilet cleaning liquid for cleaning.
20 16 Guangzhou Daily "Backwash of toilet cleaning water? Is toilet block carcinogenic? Rumors! In the manuscript, the relevant person in charge of Guangzhou Water Supply Company said that under normal circumstances, toilet water will not flow back; Even if there is backflow, you can let the water flow naturally for a few minutes after the water supply is restored and take it away. There are only one or two cases of toilet cleaning water flowing backwards in Guangzhou every year. Chen, a senior experimenter at the School of Chemistry and Chemical Engineering of Guangzhou University, said that toilet water is corrosive, but it is harmless to human body if it is not drunk.
In Guangming Daily (20 15), there is no scientific basis for the report that "toilet blocks cause cancer". Both the branch of the Propaganda Department of Popular Science of China Anti-Cancer Association and the deputy director of the National Cancer Prevention and Research Office said that there is no scientific research to prove that toilet blocks are related to cancer, and there is no clear scientific basis for the statement that toilet blocks cause cancer. Moreover, the toxicity of any carcinogen must be accumulated to a certain amount, which will cause harm or cancer to the human body. The online statement is too exaggerated.
Since 20 15, there has been a rumor about "toilet cleaning block causes cancer" every year, but this rumor has revived again and again and continues to spread on the Internet, deceiving netizens. The "Seeking Truth" column reminds us that we need to be more skeptical when encountering similar news. If you check whether it is an old rumor through online search, the more cautious netizens are, the less rumors spread. Do not believe in rumors, do not spread rumors, * * * with the maintenance of a clear network.