In ancient times, the industry of smelting aluminum was on the rise. However, during the smelting of aluminum, there was a by-product of fluoride, which was quite a big problem.

At the beginning, people did not realize the harm of this by-product of fluoride. It dispersed around the aluminum smelting workshop, attached to grass and trees, and merged into the water and soil. Those who worked in the meantime, although they worked hard every day to smelt aluminum, did not know that the scourge had quietly approached.

Over time, those who lived near the workshop gradually felt physical discomfort. The teeth were discolored, and the soreness came from time to time, and even fell off in severe cases. The limbs also often felt pain, the movement slowed down, and the strength was no longer what it used to be. The root cause is caused by the by-product of fluoride produced by aluminum smelting. This fluoride enters through the mouth and nose, accumulates in the body, erodes the muscles and bones, and damages people's health.

Some wise people see this and know that this harm cannot be eliminated. So they tried countermeasures to improve the method of smelting aluminum, in order to reduce the amount of fluoride by-products. Ditches were also set up in the workshop to divert fluoride-containing wastewater to a distance, so that it would not pollute the local water and soil. Trees were also widely planted around the workshop to purify the air and prevent the diffusion of fluoride.

After this rectification, the harm of fluoride by-products in the aluminum smelting place has become lighter, and the diseases of the residents have become less frequent. Everyone began to know that when working for a living, they must not ignore the environment and human health, and they must always pay attention to the fluoride by-products of smelting aluminum and deal with them cautiously.