Can bacteria be used to purify water?

Bacteria are used to purify water. Some species are capable of breaking down or absorbing hazardous chemicals. Bacteria are often used to clean not only ponds and other bodies of water, but also to treat wastewater. Of course, bacteria alone are not enough for wastewater treatment. There are too many organic and inorganic compounds. But the role of bacteria is very important. Special bacterial species are grown in special laboratories and supplied to customers. It is a very popular, inexpensive and effective way to remove a number of hazardous substances from water.