Hearing someone knock on the door, the others in the shop subconsciously turned to look at the door.
Coincidentally, someone they knew had come.
Electrician Wu stood at the door and looked in. Another old man of similar age was waiting on the sidewalk on an electric bike.
"Wu, is this the place?" the latter asked with a high-pitched voice.
As it was bright outside and dark inside, Electrician Wu narrowed his eyes and scanned everyone's faces. His gaze fell on Zhang Zian, and he said in surprise, "Hey, young man, it's you?"
"Master Wu, you're here. Come in quickly … Is that your friend outside?" Zhang Zian went over to greet him.
Electrician Wu hesitated for a moment, then nodded. "He's also a retired employee of our factory. His surname is Zhao, and he's a welder."
Then, he waved at the person outside. "Come in. Lock the bike. Don't let it be stolen. "
Welder Zhao was a skinny old man. His teeth were black and yellow from years of smoking, and he had a strong smell of smoke. He pushed the door open and shouted as soon as he came in, "Here? Wu, are you kidding? Isn't this a newly opened shop? Look, this thing hasn't been cleaned up yet! Let's go find an old shop. I don't trust a new shop. It might close down in a few days! "
As he spoke, he went to pull Electrician Wu along.
Electrician Wu was a little hesitant, but Zhang Zian had helped him out at the fish market before, so he was embarrassed to just leave like that.
"Master Zhao, right? I completely agree with what you said. But, my shop has been operating on this street for more than ten years. It's not a new shop! "Zhang Zian interrupted.
"Not a new shop?" Welder Zhao sneered and pointed at the walls and floor. "This is a freshly painted latex paint. The smell hasn't completely dissipated yet. It's been renovated for less than a month, and you're telling me it's not a new shop?"
"You have a good eye! You can even tell that! This shop is indeed new, but the shop next to it is also mine. I've been operating on this street for more than ten years. If you don't believe me, you can ask around. "
Zhang Zian understood why Welder Zhao wanted to find an old shop. Even if it was the almighty Taobao, everyone wanted to find an old shop with a high sales volume. It was for peace of mind. If they were going to be cheated, they would all be cheated together …
Welder Zhao walked out doubtfully and came back after a while. He nodded and said, "Okay then, I said something wrong."
Zhang Zian sent Lu Yi Yun back to the pet shop and asked, "Master Wu, are you here to look at the 24V heating rod?"
Welder Wu nodded and looked at the aquatic creatures that Zhang Zian had brought back.
"Let's take a look at the heating rod and the fish," he said.
Welder Zhao complained disapprovingly, "Old Wu, I told you not to waste your money. Isn't a heating rod that costs twenty to thirty dollars the same? "Welder Welder Welder Can Better Fish with" You "." "Welder Welder Can Few Hundred Can Can to Feed better fish."
Electrician Wu waved his hand helplessly. "Old Zhao, don't try to persuade me about this. I've made up my mind, and there's no point in trying to persuade me. The problem isn't the fish, but safety. You're not an electrician, so you don't understand how dangerous electricity is."
It seemed that before they came, Welder Zhao had tried to persuade him more than once, but he was determined to buy a safer heating rod, so he rejected Welder Zhao's advice.
"Look at you … The older you get, the more stubborn you become!" Welder Zhao pointed at him in disappointment.
Wang Qian and Li Kun had a lot of opinions about Welder Zhao. You and Master Wu are not family. Did he eat your rice or use your electricity? Was there a need to care so much? It was fine if the other party didn't want to listen to him, but there was no point in trying to persuade him.
Before coming into contact with high-end aquarium equipment, Zhang Zian didn't think that high-end equipment was very good. But after coming into contact with it, he understood. You get what you pay for, and you get what you pay for. You get what you pay for. You get what you pay for. You get what you pay for. You get what you pay for.
He brought a 24-volt heating rod imported from Germany to Electrician Wu. "Master Wu, take your time and look at it. You can also try it on the spot."
Electrician Wu said embarrassedly, "To tell you the truth, I did bring a multimeter …"
He took out a multimeter from his bag. He didn't bring it with him when he went to the fish market last time, but he was more careful this time.
"It's okay. You can try it. That's artificial seawater. Its conductivity should be about the same as natural seawater." Zhang Zian pointed at a row of buckets in the corner. He had instructed Wang Qian and Li Kun to mix the artificial seawater. They were just waiting for the aquarium tanks to arrive. After teaching them once, they would do it themselves next time.
"Heh, artificial seawater," Welder Zhao said disdainfully. "It's just a few steps away from the sea. What artificial seawater? It's just a waste of money. "
Zhang Zian retorted calmly, "You can't say that. The natural seawater near the shore is inevitably polluted, especially near the city. It's okay to raise ordinary novice fish, but it's better to use artificial seawater for high-grade fish. Otherwise, it'll be too painful if one of them dies."
Electrician Wu was quite interested. He used to bring back natural seawater from the beach to save money, but he felt that novice fish could no longer satisfy him. He was preparing to raise some high-quality fish.
"How do I mix artificial seawater?" he asked.
"The salinity of natural seawater is 34% to 35%. Prepare artificial sea salt and fresh water, then buy a normal hydrometer and mix it according to the temperature-salinity -density table that comes with the hydrometer." Zhang Zian explained briefly, then raised his hand and pointed at the buckets in the corner. He emphasized, "But there are some things you need to pay attention to. When you mix artificial seawater, don't use metal containers. Iron, aluminum, copper, and so on."
"Because seawater corrodes metal?" Electrician Wu seemed to understand.
"One reason is because of that. Two, after metal is corroded, a large amount of metal ions will enter your artificial seawater. The pollution of natural seawater may not be that serious … You see, I'm using the cheapest plastic bucket in the supermarket," Zhang Zian said.
Electrician Wu took a deep breath. "If you didn't tell me, I might have really used the iron bucket at home. After all, it's sturdy …"
"Do you have artificial sea salt here? How much does it cost? "he asked with interest.
Zhang Zian answered, "We have both high-end and low-grade ones. It depends on which one you want."
"What's the difference between high-end and low-grade?" Electrician Wu asked again.
Zhang Zian took out two bags of sea salt for him to compare. "The main components of sea salt are sodium chloride, magnesium sulfate, and potassium chloride. These make up 90%, and the remaining 10% are trace elements. This is the difference between high-end and low-grade. Low-grade sea salt contains more than 20 trace elements, while high-end sea salt contains more than 40. If you only raise fish, then buy low-grade ones. There's no need to waste money. But if you also raise corals and sea anemones, without enough trace elements, their colors won't be bright. "
Wang Qian, Li Kun, and Jiang Feifei listened attentively. They felt that they had learned a lot.
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