External feedwater treatment is specifically designed to address what type of issues found in natural water?

External feedwater treatment primarily focuses on removing solids and other pollutants from natural water sources to ensure that the water fed into a system is of high quality. Natural water often contains various impurities, such as suspended solids, organic matter, and chemical pollutants, which can lead to operational problems in boilers and other water systems. These impurities can cause scaling, fouling, and other issues that negatively affect the efficiency and longevity of equipment.

By implementing external feedwater treatment processes, such as filtration, sedimentation, and chemical treatment, these impurities can be reduced or eliminated. This treatment is crucial for maintaining the efficiency of heat transfer, preventing corrosion, and minimizing maintenance efforts in boiler systems.

While corrosion resistance, temperature stability, and flow rate efficiency are important factors in the overall performance of a water system, they are more related to the design and operation of the system itself rather than the specific purpose of external feedwater treatment, which is primarily aimed at preparing feedwater by addressing the issues related to solids and pollutants.