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.
Water that contains high amounts of calcium and/or magnesium is considered hard, and water with low amounts is soft. Water hardness is determined by the level of calcium carbonate in water (in milligrams per liter) [11]: 1  Soft = 0-60 mg CaCO3/L.  Moderately hard = 61-120 mg CaCO3/L.