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Water Hardness Calculator — Free Online Tool
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Water Hardness Calculator

Calculate water hardness classification and CaCO3 equivalents

Classification Scale (mg/L CaCO3):
• Soft: < 60 | Moderately Hard: 60–120
• Hard: 120–180 | Very Hard: > 180
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⚠️ Water hardness is primarily caused by dissolved calcium and magnesium ions. High hardness levels can cause scale buildup in pipes and appliances, while very soft water may be corrosive to plumbing systems.

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