You suddenly open the water pipe that has not been used for a long time and you find that it is "yellow" water flowing out. In the past, this kind of thing is very easy to happen in the galvanized iron pipe in the old house. Such "yellow" water is also harmful to the human body. Four ministries and commissions including the Ministry of Construction of China also issued a document clarifying that galvanized pipes have been banned from 2000, and galvanized pipes are rarely used for cold water pipes in newly built communities.
Advantages: complete varieties and many matching pipe fittings.
Disadvantages: it belongs to the obsolete products banned by the state, and it is easy to corrode and rust, resulting in poor water flow and easily polluting water sources.