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Found Hardness 2 times.

Displaying results 1 to 10.

1. Hardness (hard water)
Total concentration of calcium and magnesium ion s, expressed as the equivalent concentration (mg/L) of calcium carbonate. "Hard" water is water that contains lots of calcium carbonate and other minerals.

2. Hardness (total hardness)
In water, the total concentration of calcium and magnesium ions expressed as mg/l calcium carbonate.

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