There are many uses of water like drinking, watering, bathing, and so on. If it contains some impurities it is unfit to use. There are two kinds of water impurities, soluble and insoluble impurities. Soluble impurities get dissolved in the water. And insoluble impurities do not get dissolved in the water. Salt is an example of soluble impurities. Sand and germs are examples of insoluble impurities.