The carbon dioxide does so simply by dissolving in the water and forming a weak carbonic acid which attacks the metal in feed systems, boiler or condensate system. Oxygen is present in all waters, so that red iron oxide forms on a mild steel surface immersed in water.
Kung natunaw ang carbon dioxide sa tubig, maaari itong gumawa ng mahinang asido na maaaring kumain sa metal ng feed system, boiler, at condensate system.