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The blue color comes from an additive that keeps evaporated salt free flowing. Normally this food grade additive would appear colorless to yellow. When the substance comes in contact with iron sulfate or dissolved iron in some hard waters, it turns blue. Not all pellets contain this additive and thus do not change color.

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16y ago
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6mo ago

Salt pellets used in water softeners can turn blue due to a dye that is added to help identify the type of salt. Blue pellets are typically used for potassium chloride salt, which is an alternative to traditional sodium chloride salt in water softening systems. The dye is safe and non-toxic, and it helps prevent mixing up different types of salt.

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Q: Why do salt pellets turn blue?
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