Water treatment systems
Investigate the salinity of different water samples
Water is crucial to human life, but it can also be a killer.
Drinking or cooking water contaminated with micro-organisms or chemicals is a leading cause of disease and death across the world. Poor facilities for the disposal of sewage and other waste water can quickly lead to the spread of dangerous diseases.
Activity info, teachers’ notes and curriculum links
In this practical activity students investigate the salinity of three different water samples using a multimeter. Students first calibrate their salination probe and test the salinity of their solutions. Students can be asked to suggest how errors might have appeared in their results and what could be done to minimise or eliminate them.
This activity can be used as an extension to the 'Filtering water' activity – see the Related activities section.
The activity sheet includes teacher notes, guidance, useful web links, and links (where appropriate) to the national curriculum in each of the four devolved UK nations; England, Northern Ireland, Scotland and Wales.
Download the activity sheets for free below!
All activity sheets and supporting resources (including film clips!) are free to download, and all the documents are fully editable, so you can tailor them to your students' and your schools' needs.
You can stream and download the related films for free by clicking on the appropriate link in the Related resources section below.
And please do share your classroom learning highlights with us @IETeducation
Available Downloads
Activity overview
Activity description, teachers' notes and curriculum links
Handout
Calibrating your salination probe
Quiz
How important is water to human life? Take the quiz and test your knowledge - but be careful because each wrong answer will result in an increase of bacteria in the water supply
Videos
Pure water
Related resources
We’re upgrading our systems, and this includes changes to our customer and member account log in, MyIET. It’s part of our big picture plan to deliver a great experience for you and our wider engineering community.
Whilst most of our websites remain available for browsing, it will not be possible to log in to purchase products or access services from Thursday, 17 April to Wednesday, 30 April 2025. Our Member Relations team is here to help and for many of our services, including processing payments or orders, we’ll be able to support you over the phone on +44 (0)1438 765678 or email via membership@theiet.org.
We apologise for any inconvenience this may cause and thank you for your understanding.
For further information related to specific products and services, please visit our FAQs webpage.