The term “hard water” when used in this present application is understood as water that includes {HEAD ~ a variety} of {TAIL ~ minerals} or inorganic salts, particularly cationic alkali metal salts, for example, calcium salts, magnesium salts, iron salts 
of
The term “ hard water ” when used in this present application is understood as water that includes { HEAD ~ a variety } of { TAIL ~ minerals } or inorganic salts , particularly cationic alkali metal salts , for example , calcium salts , magnesium salts , iron salts
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH