Iron aesthetic effects

Red Water Control. Dissolved metal ions like iron and manganese play havoc with the aesthetics of ceramics systems that come into contact with waters containing them (e.g., bathtubs, wash basins, and stucco sprayed by lawn sprinklers). The addition of high-ratio silicates will effectively eliminate this problem through the formation of metallosilicate complexes, which remain suspended in the water (12). 

In some water supply areas, problems are experienced with the corrosion of old cast-iron water mains, such that iron (red-water) discolouration can become an aesthetic problem with iron concentrations exceeding several parts per million (mg/1). In such cases, the loose iron corrosion deposits can settle within a lead pipe and absorb lead it is likely that this absorption enhances lead dissolution from the lead corrosion deposit as the equilibrium concentration for the dissolved lead is given less opportunity to be realised. Any disturbance of the loose deposits, such as the scouring effect of high flow, can cause elevated concentrations of lead in the drinking water. As an approximation, lead concentrations can double as a consequence of the interaction with loose iron deposits. Particulate lead may also arise from the physical sheer of pieces of the lead corrosion deposit from within the lead pipe, as a consequence of physical damage (as can occur in partial lead pipe replacement). Vibration from heavy road traffic might also cause pieces of the lead corrosion deposit to sheer. There is some evidence (Cardew, 2009) that the lead... 

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