Time passed without a panic, and Chen Xin's life did not change much in this month, waking up from the alarm ring of his mobile phone on time every day, just as he had to sleep until he woke up naturally every day in the past.

There was no day in the shelter, and it was meaningless to judge day and night by light, so in order to avoid not knowing the time when he slept at night, Chen Xin reset the alarm on his mobile phone.

Since resigning a few years ago to write a novel, this is the first time that Chen Xin has turned on the alarm on his mobile phone.

However, returning to a regular routine is also a new experience for Chen Xin, at least he feels that his mental state and physical condition are much better.

After getting up, Chen Xin will tear up a generation of self-heating food for breakfast, and while waiting for the self-heating food to heat up, he will take advantage of this time to do more than ten minutes of exercise to exercise his body.

Wait until the warm-up is over and breakfast is cooked, and eating at this time will make you more appetizing.

After eating, Chen Xin would spend the morning checking the operation of various equipment in the shelter and filling up the generator.

After activating the generator to power the entire shelter, he spends the morning in the greenhouse.

Although there is no need to weed and remove insects, watering, fertilizing, and loosening the soil still need to be done.

Needless to say, watering and loosening the soil, although Chen Xin has never done it before, but with the video data in the computer, he can still do it almost the same, and he can basically meet the requirements of planting.

Although these vegetables are not very lush, they are basically growing healthily, and there is nothing wrong with them.

The only thing that made Chen Xin a little unbearable was fertilization.

Chen Xin didn't buy fertilizer when he moved into the shelter, and the soil in the greenhouse was also obtained from the vegetable garden of a nearby farmer's uncle, and the soil quality was certainly not a problem, and it was a vegetable plot kept by the farmer's uncle's family, and he usually planted vegetables for his own food, so he did not use chemical fertilizers and pesticides.

However, when the farmer uncle sold the soil to Chen Xin, he also specially reminded him that if you want to grow delicious vegetables, you must remember to fertilize.

Of course, the fertilization that the farmer uncle said was not chemical fertilizer, but the legendary ...... Farmyard manure.

To put it simply, this is the liquid obtained after fermentation using the previously introduced black water part of the Evacuation Shelter Water Recycling System, and the gas produced during the fermentation process is the legendary biogas.

Under normal circumstances, there are generally biogas digesters in rural areas, which fill the biogas digesters with human and animal excrement, straw and other organic matter, and produce methane under the decomposition of biogas bacteria, which can be used for daily cooking, heating, lighting and power generation.

It is a very common facility in the rural areas of Yanguo, which was vigorously promoted in the nineties for the treatment of human and animal excrement in rural areas and the improvement of rural living conditions.

The same principle applies to the black water treatment system in the sewage treatment system installed by Chen Xin, which uses bacteria to decompose the organic matter in the black water to achieve water recycling, while grey water cannot be directly added to the digester because it contains residues such as soapy water, shampoo and washing powder, because these things will kill the decomposing bacteria in the digester.

Chen Xin had also considered using biogas as an energy source in the shelter, but after calculating it, he found that the amount of excretion alone was not enough to meet the gas production needs of a biogas digester, so he had to give up this idea and did not use biogas as an energy source.

However, even if biogas energy is not used, the biogas digester can still be used as an important means of sewage treatment, which can effectively decompose organic matter in sewage and accelerate the recycling of water resources.

Just the smell of the fermenters used for sewage treatment......

Compared with the stinky socks that have not been washed for a month in the boys' dormitory and the fermentation tank that has not been opened for a month, it is probably the difference between stinky tofu and canned herring.

That sour...... Chen Xin went in with his own gas mask, but he still almost had tears coming down.

Fortunately, the sewage treatment tank was outside the container room, and Chen Xin took into account the smell of this thing and turned on the forced ventilation, so that the smell would not spread to the entire shelter.

The recycled sewage that had been fermented for a month was loaded into the planting greenhouse by Chen Xin in a plastic bucket prepared in advance, and then poured into the soil one by one.

Although the taste of this thing is really sour, it has to be said that nature is a complete cycle, and it is these decomposed organic matter that allows plants to thrive.

After fertilization, it was watering, but what surprised Chen Xin a little today was that when he was halfway through watering, there was no water in the pipe.

This made Chen Xin shocked, and hurriedly ran to the water tank and sewage treatment tank to check, and found that the water tank that could store three tons of fresh water was empty, and the sewage collected in the sewage treatment tank was only half full.

Looking at the empty water tank, Chen Xin couldn't understand why the sewage treatment tank and water circulation system even collected the water vapor in the air, but still used up the water.

However, there is no water is no water, although there is still a lot of drinking water for drinking, and only two and a half boxes of pure water have been used, and there are still a lot of stocks, but the water for domestic use and greenhouse planting has been exhausted.

Now Chen Xin must find a way to replenish fresh water, otherwise he will fall into a water shortage crisis, or use stored drinking water to supplement domestic water.

Using drinking water to supplement domestic water is the last choice to do when there is no other way, but Chen Xin will not do it if there is any other choice.

If he does not use drinking water to supplement his daily life, there are only two options in front of Chen Xin.

First of all, Chen Xin can choose to take the risk of opening the door of the shelter and going out in search of fresh water resources.

A month has passed, and the fire caused by the meteorite impact should have been extinguished over time with the gradually decreasing temperature after the sky was obscured by dust, and it should not be too dangerous to leave the shelter now.

And this in itself was one of Chen Xin's original plans, to open the shelter after entering the shelter for a month, go out and install the antenna of the shortwave radio station, and at the same time get in touch with other companions in the survival group, and if possible, exchange supplies with several companions in the city.

At least Chen Xin can be sure that a companion in the city has no greenhouses to plant, and he can exchange a lot of things with her by bringing fresh vegetables over.

But there is a problem with how Chen Xin can bring fresh water back.