most of the water pollution is the poor material of this part. coating is the surface material of the faucet, that is, the skin of the faucet, which is the color value of the faucet. the faucet is turned on and off every day. we can't remember how many times it is turned on and off in a day, so the first question to consider when buying is whether it can be used for a long time. when opening and closing, the movable part of the faucet is on the valve core, so if you want to use it for a long time, it depends on the quality of the 