Hard Water is a common issue in most Indian households, which is why there is an increasing demand for water purifiers for hard water. Water is considered hard when it has a relatively high number of hard minerals, usually calcium and magnesium. If you observe, you can probably see white stains on your faucets and other appliances in your house, soaps and shampoos not lathering enough your scalp too itchy and flaky, or irritation on your skin. These are the most commonly visible signs that your household receives hard water too. This is why you need to invest in a water purifier for hard water too.