Hard Water vs Soft Water - Know the Difference Hard water has high levels of dissolved minerals, mainly calcium and magnesium, causing scale buildup and soap scum, while soft water has low mineral content, allowing soap to lather easily and leaving surfaces cleaner. The hardness is determined by these minerals, picked up as water passes through rock, and affects cleaning, appliances, skin, and hair. #jujutsushenanigans #jjs #fyp #viral #moveset