METHODS	This study compared water A ( per litre : 520 mg Ca , 291 mg HCO ( 3 ) ( - ) , 1160 mg SO ( 4 ) ( - ) , Potential Renal Acid load ( PRAL ) +9.2 mEq ) with water B ( per litre : 547 mg Ca , 2172 mg HCO ( 3 ) ( - ) , 9 mg SO ( 4 ) ( - ) , PRAL -11.2 mEq ) .\