I became a stepmother and got rich with my cute baby.

Song Wanqing chuckled and said, "Master Ji must be very smart. Can the amount of water in this moat be compared with the amount of water used in the demonstration? You just need to watch me operate it. After you learn it, there is still a lot of work to do. Thank you for your help."

She stopped talking nonsense and went straight to the operating table. There were rows of red and green buttons, labeled: Start, Pause, and Off.

With a light press of her slender jade fingers, the machine in the river suddenly made a low roar, and the water around it was seen being drawn into it by an invisible force.

The container was immediately filled with water, which settled to the bottom after passing through layer after layer of transparent membranes, and then was excreted from the other side.

Everyone watching had their mouths opened wide. They had never seen such a large machine that could draw water in and then drain it out. Could this thing be used to purify water?!

Cheng Qian'an was no longer surprised by this. He walked over to Song Wanqing, who was working seriously, and gently wiped the sweat from her forehead.

Ji Huaichuan also walked behind her, pursed his lips tightly, with an obscure expression. He suddenly felt that there were too many mysteries about Song Wanqing, and she was not like an ordinary peasant woman at all.

"What is the principle of this thing?" he asked in a deep voice.

Song Wanqing looked back, pointed at the filter element in the river, and explained: "Those filter containers are equipped with filter elements, and then some active substances are configured for primary filtration, which can remove impurities such as river sand."

"Finally, we use the RO membrane to filter out the toxic molecules, and we can get a relatively clean water source. Repeat this operation several times, and the river water can be drunk."

Ji Huaichuan was overwhelmed by what he had heard. It was all stuff he had never heard of before. He simply waved his hand and changed the subject: "How long will it take to purify it?"

What he is most concerned about now is the issue of speed. Waiting a moment longer means one more death of a civilian.

"We have to wait at least an hour." Song Wanqing said in a deep voice.

Her merit points were not enough to exchange for too many filters. In addition to placing one here, other places also needed them. In addition, the moat had a large amount of water, so she could only wait here. In her spare time, she also taught ten people how to operate the machine.

More and more people gathered around, all of them with swollen bodies and unsteady steps, staring at Song Wanqing and the filter with hope in their eyes.

"I heard that a master came to the city and said he would help us remove the poison in the river."

"Is this the thing? I've never seen it before. Is it really possible?"

Song Wanqing stared at the tumbling river water and saw that after the filter had been running for an hour, the roar finally stopped. A large pool of black sewage was discharged from the drainage pipe on the shore, and all the grass and trees withered wherever it flowed.

She took out a silver needle and tested the river water, only to find that the silver needle did not change color!

"The poison has been removed." She held up the silver needle and showed everyone the results of this afternoon.

Ji Huaichuan had a complicated expression. He took the lead and scooped a bowl of water to test the poison again. It was indeed purified. He quickly turned around and ordered: "The moat water has been detoxified now. Anyone who needs drinking water can come here to get water!"

As soon as he finished speaking, the people rushed to the river to fetch water. The news spread like wildfire, and within half a quarter of an hour, everyone in the city had come.

They knelt before Song Wanqing and kowtowed in tears.

"Living Bodhisattva! Living Bodhisattva is alive!"

The people were living in dire straits. A hint of pain flashed across Song Wanqing's eyes. At the same time, the voice of Naituanzi was heard.

[Mother, your merit points are increasing so fast! I have never seen so many merit points before. It seems that your choice today is right! ]

Song Wanqing hid the emotion in her eyes, and a smile appeared on her brows. She looked at Ji Huaichuan and said, "Master Ji, the rest of the work is left to you. Other places still need purified water, so there is no time to waste."

Ji Huaichuan made hasty arrangements with a tense face. He then looked at Song Wanqing and Cheng Qian'an who were about to leave with a heavy gaze and said, "Miss Song, Mr. Cheng, please stay! I have something else to discuss with Miss Song. Can you come with me to the study?"

Song Wanqing raised her eyebrows and said, "Oh? Since Master Ji invites me, I am certainly happy to do it, but..." She looked at Cheng Qian'an and continued, "Where is my husband?"

Cheng Qi'an was immediately unhappy when he heard that the two wanted to be alone. He stood in front of Song Wanqing and threatened, "No, you can't bully my wife!"

Ji Huaichuan chuckled, shook his head helplessly, and imitated the way Song Wanqing comforted Cheng Qian'an before and said, "Mr. Cheng, don't worry, I will never bully your wife, but you have to stay in another room by yourself for a while, okay?"

But Cheng Qian'an didn't appreciate his kindness, and turned to Song Wanqing for a hug. Song Wanqing could only rub his head, staring at him and said, "My husband, I'm going to discuss some serious matters with Master Ji, will you listen to me?"

Cheng Qian'an frowned, struggling. He looked at Ji Huaichuan with hostility. After a long time, he was willing to let go of his hand and nodded aggrievedly: "Okay, I'll listen, my lady."

"That's good." Song Wanqing smiled gently.

City Lord's Mansion.

When he parted with Cheng Qian'an, he looked as aggrieved as a young wife who had been wronged, blinking and staring at Song Wanqing.

A smile appeared on Song Wanqing's lips. He waved his hand, and Cheng Qian'an was willing to go to other rooms with Ji Huaichuan's men to rest.

"Ms. Song's husband is so clingy. He's afraid that I will eat his wife in just a short while." Ji Huaichuan's voice sounded with a smile.

"That's natural. After all, you've been married for so many years and you've long been accustomed to having me by your side. It's natural for you to worry about me." Song Wanqing frowned and smiled, her curled eyelashes trembling like a butterfly about to fall from a branch, moving and quiet.

Helplessness flashed across Ji Huaichuan's eyes, and he felt regretful again in his heart. Such a good person actually married a fool, and they seemed so loving.

What a pity!

"Come on, let's talk in the study." He said lightly, leading the way with a graceful figure.

Song Wanqing followed him into the study and saw that the previously messed up place had been tidied up. She said, "Master Ji's men are quite quick."

It seems that even servants can enter this study, so I don't think there will be any confidential things hidden in it.

Ji Huaichuan just smiled without saying a word, just like a fox. However, there was no smile in his deep eyes, which even made people feel a little chilly.

"Tell me, what is the purpose of Mr. Ji asking me to come to the study?" Song Wanqing opened her red lips and imitated his fake smile.

"Ji just wants to know where Miss Song came from and how she could understand such a wonderful principle to dissolve the poisonous fog in the water."

So that’s why?

Song Wanqing gently stroked her chin with her slender fingers and tilted her head and said, "I'm just a concerned citizen."

"Concerned citizens?"

“They are just the more enthusiastic people~”

Ji Huaichuan suddenly laughed, and this time his laugh was genuine. He took out a fan from somewhere, pointed at the desk where Song Wanqing was subdued before, and said, "How dare an enthusiastic citizen break into the city lord's study?"