Water is from aggressive to ...

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Water is from aggressive to corrosive (according to RI index), as told by esteemed Colleague. 
Yo may use this calculator (https://www.lenntech.com/calculators/ryznar/index/ryznar.htm) or many others.
Permeate should be blended or corrected in TAlk to comply with Avg. values prescribed in CCC by many OEM. We (DANIELI) used to always prescribe a value for CaH+TAlk to comply with.
HTH