In the circulating water system, scale is supersaturated water soluble components of the formation, a variety of dissolved salts, such as bicarbonates, carbonates, chlorides, silicates, of which the dissolved bicarbonate salts such as Ca (HCO3) 2, Mg (HCO3) 2 Most unstable, very easy to decomposition of carbonate, therefore, when the cooling water of dissolved bicarbonates more water flow through the heat exchanger surface, especially a hot surface, heat will break down; phosphate dissolved in water when calcium ions will also produce precipitation of calcium phosphate; calcium carbonate and Ca3 (PO4) 2, etc. are difficult solubility salts in general also different, not its solubility increases with temperature increase, but with the temperature rises.
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