The way to clean water for free is simple, South Africa is located in the subtropics and has plenty of sun.

To disinfect drinking water, simply fill some plastic bottles with water and put it on a piece of aluminum foil or a piece of aluminum sheet, and expose it to sunlight.

Within six hours, the long-wave ultraviolet radiation from the sunlight kills all viruses, bacteria and parasites in the water.

Song Chao introduced Yang Shubao: "This is called SODIS, the Swiss pioneer drinking water disinfection method, which is simple and effective for solving the problem of drinking water pollution. There's almost no extra money, plastic bottles are everywhere, and foil and flakes aren't hard to find, right?"

This drinking water disinfection method was invented by a Swiss water research institute and has been practiced on the African continent for a long time.

Fortunately, South Africa is safe, at least the country is stable, the economy is good, and most of the people can drink disinfected drinking water.

In other countries such as Mozambiga, Tanzania and the Democratic Republic of the Congo, tap water is contaminated, not to mention water accessible to people in rural and tribal areas.

Song Chao told Yang Shubao a statistic that they had done SODIS promotion in a poor town in the Northwest Province of South Africa.

Before the sterilization was introduced, the rate of diarrhoea among children and adolescents under the age of 16 in the town was an astonishing 90 to 95 percent, so much so that the locals thought it was normal, and instead thought that the children who had normal bowel movements had intestinal problems.

After switching to SODIS-treated water, the diarrhoea rate among local children and adolescents has been reduced to 10 to 15 per cent in just half a month.

This activity was led by Zheng Zhiyi, and this incident was also broadcast on South African television, and Zheng Zhiyi's ability to receive the chieftain's golden scepter awarded by the president has something to do with it.

However, SODIS has a problem: South Africa has a lot of rains after the rainy season, and children have a high demand for water, and they do not always have access to clean drinking water.

Therefore, now the volunteer team of the Confucius Institute wants to promote a kind of water purification equipment, water purification clay pots.

The shape of this water purification clay pot is similar to that of a funnel, and the caliber is the same as that of a water bucket commonly used in the area, and the water will flow slowly when it is poured into the bucket.

Because of the unique firing technology of clay pots, this clay funnel can filter out macromolecules such as bacteria, parasites and other pollutants, and purify the water.

In other words, this clay pot is a filter cartridge, a super rudimentary version of the filter cartridge.

Such a filter cartridge is enough for the poor people living in remote areas and slums, at least to solve the basic water pollution problem.

Interestingly, the researcher of this technology is a teacher at the Massachusetts Institute of Technology in the United States, and after he invented this water purification device, he also appeared in the Massachusetts Institute of Technology Forum's top ten funny inventions of the year.

Because in the United States, where the economy is developed and the waste of living materials is serious, this kind of water purification equipment has no effect at all.

However, the original intention of the teacher to invent this device was not funny, so he united his colleagues and African students to promote this equipment to Africa, which is the most plagued by water pollution problems in the world.

"There is a small episode here, in fact, the first thing they want to promote is our China, in the hearts of these old Americans, our China is still the living state before the reform and opening up, and we can't eat clean food and drink clean water. As a result, the teacher went to the magic capital with funds and technology in a hurry, and he was stunned as soon as he got off the plane. Lin Lin said with a smile.

"Yes, he thought that the magic capital was a modern city built by China with the strength of the whole country for foreigners, and then he secretly chose a city and ran over, and the city he chose was called Hangzhou......"

Then the teacher turned the support trip into a tour, and he came with $10,000 to build a clay pot to burn clean water. As a result, the pottery furnace was definitely not built, so he took the 10,000 dollars to take a good turn in China and bought a bunch of special products to go back. ”

found that China is not as poor and backward as the propaganda, and the teacher's three views were impacted.

He thought about Africa again, but with China's lesson in mind, he was afraid that Africa's poverty and backwardness would also be the result of the media's wanton propaganda, so he wanted to explore a way first.

In order to determine that Africa is really poor and backward and needs a clean water clay pot, the teacher ruthlessly chose Chad, which is relatively the safest but poorest in Africa.

Hearing this, Yang Shubao showed an unbearable expression, he had heard of Chad's terrible.

Song Chao also couldn't bear it: "This teacher is a teacher of MIT, and he is definitely above the middle class in the United States, so what kind of life is he living? What about Chad? Electricity is a luxury here, only 2% of the country's residents have access to electricity, and only 9% of the capital's residents have electricity." ”

"I have a classmate from Chad who said that their tribe only has electricity in the chief's office. A young man named Jiang Hang shook his head and said.

"It's summer when the teacher goes, do you know what the maximum temperature in Chad is in summer? 50 degrees! 50 degrees without electricity!"

The teacher had been in Chad for less than a week, giving out a few clay pots and then running away, saying he would rather go to the school BBS and be ridiculed than live like this. ”

"But Chad really needs this, right?" asked Yang Shubao, "There seems to be a problem with drinking water in Chad." ”

Song Chao nodded: "Yes, Chad's urban infrastructure is backward, only 48% of the urban population has clean drinking water, and only 2% of the population has access to basic sanitation equipment, which is absolutely promising, but who will do it?"

He glanced at the group, and they shook their heads with palpitations.

They are college students, not saints.

The MIT teacher released the patent for the water purification clay pot after returning to China, and Zheng Zhiyi learned about it during a visit to Boston University Town.

The students are working for him, and this product will definitely not be done by himself, and he asked these international students to promote this technology, which has become his biggest credit as a leader, and he has no loss.

Yang Shubao shook his head: "Isn't this authentic?"

The international students were sullen, but they had nothing to say.

Song Chao sighed and said: "Actually, if this thing becomes good, it will be beneficial to us, and we will basically stay here in South Africa in the future, which can add a lot of light to our resume." ”

Yang Shubao asked, "Then did you go to implement it?"

"It's been implemented, but it's not easy to implement. ”

"We send it out for free, but it doesn't work, we can't send it out for free. ”

"Lao Hei is too ignorant, some tribes of Mader still think that we sent this to curse them, and they actually hunted us down, that is terrible!"

Listening to the screams of the international students, Uncle Yang rubbed his chin and said, "In this way, I will help you implement this matter, and I will contact you Dean Zheng, and he will not interfere in this matter, let's do it ourselves." ”