I totally agree!  There is EU standards "Water-tube boilers and auxiliary installations - Part 12: Requirements for boiler feedwater and boiler water quality" (12952-12) which is has good approach, even for silica and [OH] ratio.

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I totally agree! 

There is EU standards "Water-tube boilers and auxiliary installations - Part 12: Requirements for boiler feedwater and boiler water quality" (12952-12) which is has good approach, even for silica and [OH] ratio.