If the city's tap water supply is still unimpeded, Chen Xin can find a way to connect a water pipe from his original home and add water to the water tank, which is how he used the long water pipe connected by the construction team to add water when the shelter was built.

But now, on the one hand, the construction team has left, and Chen Xin does not have a long enough water pipe, and on the other hand, Chen Xin is not sure whether the tap water is still a supply.

In the month following the meteorite impact, the Earth's surface was almost completely covered by fires and heat, and meteorites fell from time to time, and it is a matter of concern whether the waterworks can survive such a catastrophe.

What's more, even if the waterworks can be preserved, the government is still running to ensure the water supply of the shelter facilities, but how can Chen Xin pour tap water into the water tank of the shelter?

Water pipes? Chen Xinxin didn't have such a long water pipe, and all he could use was a bunch of 1.5-liter mineral water bottles.

Some people may say that it is not enough to bottle mineral water, but it is a big deal to fill a few more bottles!

That being said, it is true, but before bottling water with mineral water, it is better to briefly explain the relationship between the volume and weight of water, that is, the density of water.

Pure water should have a density of 1 in the standard state, that is, a liter of water weighs one kilogram, and a ton of water has one cube.

Chen Xin's water tank can hold three tons of water, that is, three cubic meters, and he has 30 1.5-liter mineral water bottles in his hand, that is, if they are all full, he can transport 45 liters, a total of 90 catties of water, which is about the weight of a girlfriend.

Without considering Chen Xin's physical fitness or time, how many round-trips do you need to fill the water tank?

This is not a difficult problem, and even first-graders who have learned addition, subtraction, multiplication, and division will be able to figure it out.

The water tank with a total volume of three tons, converted into liters, is 3,000 liters, Chen Xin can transport 45 liters at a time, after a simple division calculation, and a simple rounding we can conclude that Chen Xin has to make at least 67 round trips to fill his tank.

This is really not a number that people can feel at ease, who can pick up their girlfriend and run back and forth more than 60 times at a time?

If it was ten times or eight times, Chen Xin wouldn't think about it, just go out and find a faucet or a clean water source that can still be used now, and the irrigation will be over.

But sixty-seven times, this is really a number that makes Chen Xin have no desire to act.

It may be possible to replenish it in several times, but only if Chen Xin can find a stable source of water.

So at this time, he should consider the second option, using the system to upgrade the water recycling system of the shelter, and see if he can find a solution.

The reason why this solution was not considered in the first place was because the system could not be created out of nothing, and existing things had to be upgraded.

Chen Xin's shelter itself has no water source, whether it is external tap water or an internal well, which was not prepared when the shelter was built.

Chen Xin did consider digging a well for the shelter, so that even if he ran out of pure water, he could get new fresh water resources.

It's just that when the shelter was built, the construction team Chen Xin hired did not have the equipment to drill wells, and he did not contact the construction team that could drill wells.

Chen Xin's city is located in the south of Yanguo, close to Daze, and the groundwater resources are very rich, and many hand-cranked pumps for pumping groundwater can indeed be seen in the countryside in the past.

However, during the previous construction, due to the construction period and the lack of contact with the construction team, Chen Xin had to give up this idea even though he wanted to dig a well for his shelter.

Now that Chen Xin wants to upgrade the water supply system in the shelter, Chen Yu is not sure whether there will be an upgrade plan that can extract groundwater.

However, at the thought of having to run sixty-seven times to find water outside, Chen Xin could only bet on whether there was something he needed in the upgrade plan of the system.

Fortunately, the survival system that was picked up did not disappoint Chen Xin.

"Water supply systems with water scarcity"

"Upgrade plan 1: upgrade the material of the water supply system pipes, improve the efficiency of sewage recycling and regeneration, the volume of the water tank is +2 cubic meters, the reclaimed water quality is +1, and the survival point required for upgrading is 500"

"Upgrade plan 2: upgrade the material of the water supply system, improve the efficiency of the water recycling system, increase the pump of the pump, the volume of the water tank is +5 cubic meters, and the survival point required for the upgrade is 300"

"Note: The pump pump has a usable head of 50 meters, and the pump is only used for pumping water, based on the refuge, and groundwater cannot be obtained if there is no aquifer within 50 meters underground."

Seeing that the pump appeared in the upgrade plan, Chen Xin immediately breathed a sigh of relief, as for the remarks on the second upgrade plan, Chen Xin just glanced at it and didn't care.

This is the south of the Yan country, known as the place of Jiangnan Water Town, the city is next to Yunmeng Daze, the groundwater is abundant beyond imagination, Chen Xin when he built the shelter, but also deliberately considered waterproofing and avoiding digging groundwater.

As for whether there is groundwater 50 meters underground, this is something that Chen Xin does not need to worry about at all, because the place where Chen Xin lived before used to have a well with a hand-cranked water pump installed, but now it is abandoned.

Chen Xin didn't think much about it, and directly used the survival points accumulated in the past month to click on the upgrade of plan 2.

Upgraded grid-like lights reappeared in the Vault once again, only this time they covered the water system.

And Chen Xin once again witnessed the power and magic of the system, because in the process of upgrading just now, Chen Xin saw with his own eyes that a machine pump was formed by a grid of light, which was condensed and formed in front of his eyes.

Seeing the appearance of the pump, Chen Xin couldn't help but sigh at the magic of the system, checked the circuit of the pump, and went to the power distribution room to look at the switch, then turned on the power of the pump, and let the pump start to work.

It's a very small pump, not very powerful, but it still makes a buzzing sound when it works.

The noise from the pump is a little noisy, and it looks like a noisy bear child compared to the generator next to it, but at this moment, Chen Xin is staring nervously at this "bear child", hoping to hear the sound of water flowing from the roar of the machine.

Although he knew that there was groundwater underground, Chen Xin was still a little nervous, what if the water layer was a little deeper?

However, the "bear child" obviously didn't let Chen Xin think about it for too long, just when Chen Xin was thinking about what to do if he couldn't pump water, there was a sound of water flowing in the pump, and soon the sound of the pump running became abrupt, and the water tank on the side, which had more than doubled in size and was embedded in the wall, also sounded the sound of water.

Water, pumped up.