Very good. It is recommended to use one set. The front is used to filter large substances, such as rust and sediment, which plays a very good role in protecting the filter element at the back. As mentioned above, the water output is small, I think it is relatively large, from a few liters of water to dozens of liters a minute. For example, the water purifier processes several liters of water per hour. 3M, a Fortune 500 company famous for its century-old innovation, has a strong core technology platform for liquid filtration and a liquid filtration industry for more than 90 years.

In the field of water filtration, 3M covers catering water treatment, electric water treatment and household water purification. Many internationally renowned chain restaurants, coke companies, bottled water companies and double-door refrigerator brands all adopt 3M drinking water filtration system.

You have never used 3M water purification products, but you have probably drunk 3M pure water, because 3M is the same choice as KFC, McDonald's, Coca Cola, Pepsi Cola and John. More than 90% of double-door refrigerators in the world use 3M drinking water filtration system.