inside had accumulated layers of discoloration, including brownish and orange areas near the waterline. Some surfaces appeared rough or crusty, suggesting that mineral deposits had developed gradually over time.
This kind of buildup is not unusual in households with mineral-rich water.
Hard water contains dissolved minerals, particularly calcium and magnesium. When water sits in a tank or repeatedly evaporates from a surface, some of those minerals can remain behind. Over many months or years, deposits may become increasingly noticeable.
Rust-colored marks can have several possible causes. They may be associated
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