Что такое жесткая вода? Простое объяснение минералов, накипи и жесткости воды
Water Hardness Guide What Is Hard Water? Hard water is water that contains higher levels of dissolved minerals, mainly calcium and magnesium. These minerals are naturally picked up as water passes through rock, soil and underground layers. Hard water is common in many places and is usually noticed because it leaves scale, white marks, kettle…
