What downside exists when using a glassy phosphate for corrosion control?

Using glassy phosphate for corrosion control can indeed present a downside related to its interaction with microbial activity. Phosphate serves as a nutrient source for certain bacteria in water systems, particularly phosphorous-accumulating organisms. When the level of phosphate increases, it can lead to accelerated bacterial growth, which may result in issues such as biofilm formation and potential water quality degradation.

In systems where bacteria thrive due to the presence of phosphate, there is a risk of enhanced corrosion and sedimentation, which can negatively impact the overall integrity and performance of the water distribution system. Therefore, while glassy phosphate may be effective in preventing corrosion of pipes, the resultant increase in bacterial activity presents a significant drawback that water treatment operators must consider.

Other options might present valid concerns in different contexts but do not specifically relate to the unique issues presented by the use of glassy phosphate in water treatment for corrosion control.