The one downstairs is obviously adopted by you, and there is obviously no culture flowing with the Internet downstairs.

The commonly used three-way method, 1 heating and boiling, can add 2 deoxidizers, that is, some chemicals, etc. I won't list the specific types. 3. Introduce nitrogen, which is the safest way to change the quality of your water at least. The principle is that the introduced nitrogen will hardly react with the substances in your water. It is a physical method to blow off dissolved oxygen in water by changing the partial pressure of dissolved oxygen in water. number