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Hardness: - Water hardness is caused almost entirely by calcium and magnesium ion. Other di- and trivalent metals have a similar effect, but usually are not present in high enough concentration in potable waters to cause problems. Hardness increases soap consumption in laundries and causes scale in boilers.
- Simply count the number of drops required to change the solution color to determine hardness concentration.
| Method / Chemistry | Range | Smallest Increment | Approx. Number of Tests | Case Style | | Drop count titration/EDTA | LR:1-20mg/L | 1mg/L | 100 | 8.8x6.5x5.8 inches Blue Polypropylene Carrying Case | | HR:1-20 gpg* | 1 gpg | * 1 gpg = 17.1 mg/L
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 Parameter/Range/Reagent Information
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