Water hardness:
Water hardness is a term applied to water devoting a measurement of its pH and metal salts, content water hardness usually classified in the two groups.
- Temporary hardness (pressure of Ca and mg bicarbon)
- Permanent hardness (presence of Ca & Mg sulphate and chloride)
r Hardness Scales:
Description Definition
10 d H (German) Hardness Þ 100 mg Ca0 in 1 liter of water
10 f H (France) Hardness Þ 100 mg CaCo3 in 1 liter of water
10 eH (English) Hardness Þ 100 mg CaCo3 in 0.7 liter of water
1 AH (American) Hardness Þ 1 mg Caco3 in 1 liter of water
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