Skip to main content

About this free course

Become an OU student

Download this course

Share this free course

Potable water treatment
Potable water treatment

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

3.5 Biological characteristics of natural waters

In addition to the easily visible plants and animals which live in or on a river, there are many small and often microscopic species which play a vital role in maintaining the health of a river. Their relevance to water quality is discussed further in the sections that follow.