5. Calculate the amount of sulfonic cation exchanger in the H-form and anion exchanger in the OH--form required to purify 1000 m3 of natural water containing 0.025 g/l NaCl; 0.04 g/l MgSO4, 0.12 g/l Ca(HCO3)2. The total exchange capacity of the cation exchanger is 4.2 eq/kg, the anion exchanger is 3.5 eq/kg.

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