Aguilar: Waters of Angat and Montalban Rivt 









Soft scale 





h < 0.25 



Medium scale 





h > 0.25, but 



Hard scale 





h>0.5 







Sc < 0.12 



Little 





Sc > 0.12, but 



Much 





Sc > 0.24, but 



Very much 





Sc > 0.48 



If the percentage expressions of the various constituents are 

 used instead of their values in milligrams per liter, the results 

 must be multiplied by the expression: 



Concentration value 

 100 



— 



Chemical treatment 



■ D "Hi e 



_ 



fo SL 



Cap 



£££& 



! 



l~Z 



J. 



"*• 



•.£.. 



Very little 























The results shown in Table 8 are self-explanatory as to the 

 quality of the waters for industrial purposes. 



SUMMARY 



The general characteristics of the waters of Angat and Mon- 

 talban Rivers are primary salinity and secondary alkalinity. 

 The alkalies are also present in sufficient quantities to overcome 

 all permanent hardness. 



The high sulphate content of the waters at Stations 1, 3, 4, 

 and 6 is probably due to the oxidized decomposition products 

 of iron pyrites with which Talaguio River appears to be con- 

 taminated. 



The waters are nonfoaming, noncorrosive, and, from a chem- 

 ical point of view, they may be considered satisfactory for 

 general public consumption. 



