It is the name of a prominent Christian saint, Saint Jerome, the translator of the Vulgate.Jerome ranked among the top 200 names given to boys born in the United States between 1903 and 1985. It has since declined in popularity and was ranked as the 616th most popular name for American boys born in 2008.t is the name of a prominent Christian saint, Saint Jerome, the translator of the Vulgate.
Expected Levels. Total hardness in freshwater is usually in the range of 15 to 375 mg/L as CaCO3. Calcium. hardness in freshwater is in the range of 10 to 250 mg/L, often double that of magnesium. hardness (5 to 125 mg/L). Typical seawater has calcium hardness of 1000 mg/L, magnesium.
Pool water problem - calcium hardness. Total hardness in swimming pools is a measure of all the dissolved minerals such as calcium, magnesium and sodium. For practical purposes we usually use calcium hardness as a reference in pool water chemistry. The recommended level for calcium hardness is 200 - 400 ppm, and both high and low levels result in swimming pool problems.