It depends on dissolved minerals. Water must be low in dissolved solid minerals or soluble salts to produce top quality ice. The top limit of tolerance appears to be 10 grains per gallon.
Freezing proceeds from the outside toward the center, with minerals collecting in the last part of the water to freeze. This produces that common grey-colored deposit. If iron is present, the deposit will be yellow or brown.
Large ice plants mechanically remove more of the solids before they become a part of the frozen cake. With any procedure, when total solids exceed 10 grains per gallon it is not possible to make clear, high-quality ice. More.
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