What issue arises from dissimilar metals in water systems?

The issue that arises from dissimilar metals in water systems is primarily related to cathodic corrosion. When two different metals are in contact with each other in the presence of an electrolyte, such as water, an electrochemical reaction can occur. This reaction promotes the deterioration of the more reactive metal, often referred to as the anode, which will corrode faster as it sacrifices itself to protect the other metal.

In a water system, if dissimilar metals are connected, the one that is less noble (more anodic) will experience accelerated corrosion due to this galvanic action. This not only reduces the lifespan of the metal components involved but can also lead to leaks, contamination, and ultimately system failure. Understanding the implications of using different metals together is crucial for the maintenance and longevity of water distribution systems.