1. If pure water is mixed with some pure substance, and its colour, taste and smell does not change, then it remains pure, because it is still called water. 2. If pure water is mixed with a pure substance, so that it is no longer called water, it is not valid to do Wudu or Ghusl with this [altered] water. 3. If ordinary water is changed with the addition of any pure substance, but it is still called water – such as water that is mixed with soap and its colour changes, or hummus falls into water and changes its taste