A-Z WATER SYSTEMS - Key Persons
For piping systems fed by water from a private well, one of the most common causes of corrosion is low pH. A low pH is water with a pH of less than 7.0 pH. Signs of acidic water are corrosion of fixtures, pinhole leaks, blue staining (from copper pipes) or rust staining (from iron pipes).
Common causes for acidic water are acid rainfall due to atmospheric carbon dioxide and other airborne pollutants, runoff from mining spoils, and decomposition of plant materials. Acidic waters can be high quality and are typically low in buffering calcium minerals, but are high in dissolved carbon-dioxide gas, which can cause the low pH or acidity.
Treatment is accomplished by neutralizing the water with the use of an automatic calcite neutralizer. These water filter tanks are filled with a blend of calcium and magnesium carbonates made from naturally occurring minerals, which dissolve into the water, making it less corrosive. Calcite is a white granular mineral that adds calcium to the water raising the pH and increasing the alkalinity. Periodically, (once or twice a year for a typical residential application) more mineral is added to the filter tank.
In some cases, instead of dissolved carbon dioxide causing the low pH or acidity, the acidity is caused by mineral acids, either natural or from mining or other industrial wastes. Often the pH is very low, less than 5.0. Treating this type of water requires injection of soda ash or sodium hydroxide with a metering pump, and generally, the neutralizing type mineral filters described above will not work well on this type of water.