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Scale and sludge deposits can form on boiler heat transfer surfaces, resulting in efficiency loss and possible failure due to overheating. The most common types of deposits, those formed by calcium salts, are due to the presence of excessive hardness in the boiler feedwater. Other minerals such as magnesium, silicates, and iron can also cause deposits to form. In addition, iron returning from the corrosion of steam condensate systems is a common cause of boiler deposits. Such excessive amounts of hardness or iron cannot be effectively treated with chemicals alone. A clean, deposit-free boiler is primarily the result of maintaining high-quality feedwater and, and after proper pretreatment, utilizing chemical treatment programs that condition the remaining low levels of contaminants after proper pretreatment.