карбонатная жёсткость(воды; Alkaline hardness (also known as temporary hardness) – Calcium and magnesium bicarbonates are responsible for alkaline hardness. Alexander Demidov)
карбонатная жёсткость(воды; Alkaline hardness (also known as temporary hardness) – Calcium and magnesium bicarbonates are responsible for alkaline hardness. – АД)