Hardness
General Information
Some hardness is desirable as it protects plumbing from corrosion. Hardness values below 250 mg/L are preferable.
Excessive hardness retards the cleaning action of detergents and soaps and leads to soap scum formation.
Corrective Action
Hardness can be corrected with an ion exchange softener which replaces calcium and magnesium with sodium or potassium.