calcium hardness

calcium hardness

[′kal·sē·əm ‚härd·nəs]
(chemistry)
Presence of calcium ions in water, from dissolved carbonates and bicarbonates; treated in boiler water by introducing sodium phosphate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Be sure to balance your sanitizer level, pH, alkalinity, and calcium hardness levels to their recommended ranges so the pool is clean and clear come May of next year.
Surface active agents - Preparation of water with known calcium hardness. International Organization for Standardization; 1990.
The pH, conductivity, and concentrations of total alkalinity, total hardness, and calcium hardness in Alabama streams tended to be lowest in the Piedmont Plateau (PP) and Coastal Plain (CP), intermediate in the Ridge and Valley (RV), Appalachian Plateau (AP), and Highland Rim fHRV and highest in the Blackland Prairie (BP).
Total alkalinity and calcium hardness were analyzed with the help of lovibond Minikit (AF 444).
The parameters studied were pH electrical conductivity alkalinity total hardness calcium hardness magnesium hardness total solids total dissolved solids total suspended solids sodium chlorides nitrites sulphate and potassium.
Total Hardness = Calcium Hardness + Magnesium Hardness [Ca2.sup.+] mg/L as CaCO3 + [Mg2.sup.+] mg/L as CaCO3/Total Hardness, mg/L as CaCO3
During this study the mean values recorded for physico- chemical parameters were water temperature 19.8degC, pH 7.6, dissolved oxygen 9.65 mg/l, electrical conductivity 199.47 uS/cm, TDS 127.66 mg/l, TSS 93.78 mg/l, total hardness 118.75 mg/l, calcium hardness 75 mg/l, magnesium hardness 43.75 mg/l, sodium 5.325 mg/l, potassium 3.175 mg/l, total alkalinity 97 mg/l, chloride 15.3 mg/l and nitrite 0.0092 mg/l.
Working with fish biologist Les Torrans, Chatakondi incubated fertilized hybrid eggs in waters containing four levels of calcium hardness to determine which level yields the highest hatching success.
Two other measurements that are very important when discussing heater longevity are Total Alkalinity (or TA) and Calcium Hardness. These tests should be checked weekly and maintained in specified ratios with pH, while taking into account the temperature of the water and the number of people who are swimming.
The physical and chemical parameters tested were odor, color, turbidity, magnesium hardness, calcium hardness, phenolphthalein alkalinity, chloride, dissolved oxygen, silica, ammonia, carbon dioxide, nitrate, phosphate, zinc, iron and chromate.