Are blue toilet cleaning blocks toxic?

There was once an article that was widely circulated about blue toilet cleaning blocks causing cancer. Now that various cancers are prevalent, people have a strong sense of health awareness. After seeing similar reports, we can't help but be very worried, fearing that the blue toilet cleaning blocks themselves contain toxins, otherwise how could they cause cancer? We must have a correct understanding of this issue. So, are blue toilet cleaning blocks toxic? Let’s take a look below.

However, if the flush toilet is used for a long time, the check valve in the water tank will age and "fail". A normal check valve will automatically close when the water tank is full, but it cannot be closed if it "fails". The water in the water tank containing toilet cleaning block ingredients may flow back into the tap. Even users connected to this water pipe may be affected.

Generally speaking, even if the check valve fails, the water in the toilet tank is controlled by the normal water pressure of the tap water and cannot flow back into the tap water pipe. But there is an exception. If there is no water pressure in the tap water pipe and negative pressure occurs, the water in the flush toilet tank can flow back into the tap water pipe. Negative pressure in the water pipe usually occurs after water is cut off due to various reasons.

Perhaps due to the limited knowledge of the public about chemical reagents, the ingredients of cleaning products on the market are often expressed in a relatively popular manner and are rarely labeled with professional chemical terms.

The surfactants and detergents in toilet cleaning blocks can indeed pollute water sources, but no evidence has been found to prove that toilet cleaning blocks are carcinogenic. The harm of these chemical elements to the human body is mainly reflected in irritation, so frequent or long-term contact is not recommended.