Stir the
filtrate in container two with a Pasteur pipette.
Using the pipette withdraw a sub-sample as the filtrate is being
stirred.
![beaker and pipette](../images/Ca195.jpg)
Health and Safety
Faeces may contain hazardous pathogens (bacteria, viruses etc).
Appropriate hygiene and safety procedures should be employed. Local
health and safety regulations should be observed.
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