HACH Hardness (Total) Test Kit, Model 5-B, Drop Count Titration, 1-30 gpg, 100 tests: Product #: 145300

• Trust the original Hach test kit!
• Simple drop-count titration measures hardness as CaCO₃ (1 gpg = 17.1 mg/L)

About water hardness:
Water hardness is caused almost entirely by calcium and magnesium ions. 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.

Method / Chemistry	Range	Smallest Increment	Approx. Number of Tests	Case Style
Drop count titration/EDTA-bulk powder	1-30 gpg	1 gpg	100	2.75x2.75x5 inches