计算提高泳池钙硬度所需的氯化钙剂量。理想范围为200-400 ppm，以防止腐蚀和水垢。
Enter current and target calcium hardness levels to calculate the required calcium chloride dose. The ideal range is 200-400 ppm.
Low calcium hardness makes water corrosive, damaging plaster, metal, and equipment. High calcium hardness causes scaling on pool surfaces and equipment.
Calcium chloride generates heat when dissolving — dissolve it in a bucket of water before adding to the pool. Add in multiple doses if raising by more than 100 ppm.
钙硬度（CH）衡量泳池水中溶解钙的量。理想范围为200-400 ppm。低CH使水具有腐蚀性，会从灰泥、砂浆和设备中浸出钙。高CH导致水垢和浑浊水。
降低钙硬度的唯一可靠方法是部分排水并用新鲜水重新填充泳池。没有化学品能有效去除泳池水中的钙。