The concentration ratio k=circulating water CL-/ make-up water CL-.
Ca2+ scale inhibition ratio % =circulating water Ca2+/（make-up water Ca2+×K）×100%.
M alkali scale inhibition ratio %= circulating water M alkali/( make-up water M alkali ×K－0.6) ×100%.
△A=K－circulating water M alkali/make-up water M alkali.