水質硬度：
水的硬度是由鈣，鎂離子引起幾乎完全。其它二-和三價金屬具有類似的效果，但通常不存在於足夠高的濃度在飲水造成很多問題。硬度增加肥皂消費洗衣店，並導致大規模的鍋爐。
簡單地計算來改變溶液的顏色來確定硬度濃度所需的滴數。
方法/化學
範圍
最小增量
約。測試號
機箱樣式
一滴水滴定/ EDTA
LR：1-20mg / L
為1mg / L的
100
8.8x6.5x5.8英寸藍聚丙烯手提箱
HR：1-20 GPG *
1 GPG
* 1 = GPG 17.1毫克/升
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
