How to Measure Water Hardness: how many grains of hardness is found in your water? Definition of hard water As we explain in more detail at WATER SOFTENERS & CONDITIONERS, Water "hardness" refers to the level of unwanted minerals, principally calcium and magnesium, found in your water supply...
Calcium determines the hardness of water. It helps to adjust the pH during the mash, assists in the precipitations of proteins in the boil especially during the hot break, enhances yeast flocculation. Many lagers are made with a very low level of calcium and therefore are not required, but...