How can contaminated water be treated?

Today the problem of environmental pollution, including water pollution, is especially urgent. There is very little fresh water on earth. People do not spend it sparingly. Most of the fresh water is contaminated with various chemicals, sewage, and other pollutants and is completely undrinkable. Today, there are powerful systems for treating polluted water. There are a lot of such filters in India. There, after such a serious cleaning, the water becomes drinkable again. Small filters can also be used in field conditions. Tourists often use them.