Hard Waters

The following lists the general classification of hard waters:

Soft

Moderately hard Hard

Very hard

< 50 mg/L as CaCO3 50-150 mg/L as CaCO3 150-300 mg/L as CaCO3 > 300 mg/L as CaCO3

A very soft water has a slimy feel. For example, rainwater, which is exceedingly soft, is slimy when used with soap. For this reason, hardness in water used for domestic purposes is not completely removed. Hardness is normally removed to the level of 75 to 120 mg/L as CaCO3.

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