What chemical is fed to reduce corrosion inside the pipe network of the ROWPU?

Sodium hexametaphosphate, often referred to in its abbreviated form as sodium hex, is specifically used in water treatment processes to reduce corrosion and scale formation within piping systems, such as those found in Reverse Osmosis Water Purification Units (ROWPU). This chemical works by modifying the chemical characteristics of water, creating a more stable environment that helps to inhibit the corrosion of metals in the pipework.

Sodium hex functions by binding with metal ions and reducing their solubility while forming protective layers on the interior surfaces of pipes. This protective action minimizes the electrochemical reactions that lead to corrosion, thereby extending the lifespan of the infrastructure and ensuring that the treated water remains safe and free from contaminants that could be introduced by corroding metals.

In contrast, while polymers and chlorine have their uses in water treatment, they do not specifically target corrosion mitigation in the same effective manner as sodium hex. Citric acid is often used to clean equipment and can help in descaling, but it is not primarily aimed at preventing corrosion within pipe networks. Thus, sodium hex is recognized as the best option for maintaining the integrity of a ROWPU's piping system against corrosion.