What are iron deposits caused by the corrosion of cast-iron mains called?

Iron deposits that form as a result of the corrosion of cast-iron pipes are known as tubercles. Tubercles typically develop as small, protruding deposits on the inner surfaces of the pipes, and they can contribute to the reduction of water flow and potential quality issues in drinking water systems.

The formation of tubercles is a complex process that involves the interaction of iron with water, oxygen, and other elements, leading to localized corrosion. As these deposits build up over time, they can create problems such as blocked pipes or altered water chemistry.

Understanding the nature and implications of tubercles is essential for maintaining the integrity and safety of water distribution systems. Other terms like 'floc' refer to clusters of particles that may settle out of water but are not directly related to the type of corrosion deposits from cast-iron mains. Similarly, 'scale' generally refers to mineral deposits that form from water hardness, while 'urst specks' does not pertain to recognized terminology in drinking water systems.