Methods of analysing the quality of water are discussed in other films in this series. It is just as important, however, to ensure that the samples of water tested are representative of the water supply as a whole. Water sampling is therefore as important an activity as the process of water analysis and is the subject of this film.
A series of educational films feature on YouTube and can be viewed below, including a suite of four films on water sampling and analysis, a series of introductions to handpumps and a series on the operation and maintenance of handpumps.
This film looks at how chemicals in water can be measured, using chlorine, nitrate and iron as examples. Although the examples shown here were undertaken in a laboratory, with portable test kits, these methods can be used in the field too.
This film looks at three methods of measuring turbidity in the field – measuring turbidity with a turbidity tube; the Chinese method; and measuring turbidity using a turbidity meter.
Thermotolerant faecal coliforms are indicator bacteria, which can form colonies at 44 degrees centigrade and can provide evidence of faecal contamination of water. Membrane filtration is a means of testing the quality of water. This film presents an overview of the process.