Japanese Donghe is number one. This is absolutely unmatched by anyone. Next are Xilejia, Blue State, Tiannian, Zhongmai, Huamai, Haomei Dolijian.
Except for the above, basically all of them are not produced by themselves, they are all produced by OEMs using other people's movements. The quality is very unreliable. Additionally, water ionizers are described as “the home appliance with the most complicated after-sales service,” so I suggest ordering from the manufacturer closest to you for the safest option, because you have to make sure that someone will come and help you. you with door-to-door service in 2 years.
You can refer to some websites to help you identify really good brands. (Don't believe other people's reviews. Many manufacturers produce reviews written by their own staff. The key is to trust your own judgment!!)
Continuous Currentnaked! The direction of the current in direct current does not change, but not in alternating current! If alternating current is used to electrolyze water, sometimes hydrogen will be produced on the same electrode, and sometimes oxygen will be produced, which means that it is impossible to obtain pure gas and it is not safe at the same time, because hydrogen and oxygen are easily explosive if they exist together!