Compound

Drinking water scale

Hot water scale

Calcium oxide (CaO)

53.42

52.80

Weight in ignition

43.18

44.16

Silica(SiO2)

1.15

0.10

Iron oxide (Fe2O3)

0.79

0.03

Magnesium oxide (MgO)

0.75

2.40

Alumina (Al2O3)

0.20

0.00

Phosphorus pentoxide (P2O5)

0.18

0.14

Sodium oxide (Na2O)

0.14

0.10

Sulfur trioxide (SO3)

0.00

0.22

Potassium oxide (K2O)

0.00

0.00