Primary natural science

Students kit Water purification

Investigating Groundwater, Drinking Water Supply and Wastewater Treatment

Grade level: Grade 3 and above
Number of working groups: 15
Use: Student experiments on the water cycle, soil types, groundwater, drinking water supply, water pressure, wastewater treatment and the responsible use of water

With the Students kit Water purification, students investigate where our drinking water comes from, how it is distributed and what happens to wastewater after use. The materials are designed for 15 working groups and provide a hands-on introduction to an important topic in primary science education.

Students begin by exploring the formation of groundwater and the water cycle. Using different types of soil, they investigate how quickly water seeps through, which soils retain or block water and how different soil layers act as filters. The experiments also demonstrate that dissolved contaminants such as salt, oil or detergent cannot simply be filtered out by the soil.

Further experiments focus on drinking water extraction and supply. Students can build a simple model of a well and investigate how the water pressure required to transport drinking water to taps is generated.

In the topic area wastewater, students investigate different stages of water treatment. Model experiments demonstrate processes such as the mechanical removal of coarse materials and the function of a settling tank. This allows students to follow the journey of water from a natural resource through human use to wastewater treatment.

A comprehensive teacher's guide with methodological guidance, practical information and experiment instructions supports station-based learning. Reproducible worksheets are provided for use with the experiments.

The picture shows a red storage box containing various experimental materials. On top there are many transparent beakers, spoons and a chemical bottle, while the lower part is equipped with yellow and red equipment and tubes.
The picture shows a red storage box containing various experimental materials. On top there are many transparent beakers, spoons and a chemical bottle, while the lower part is equipped with yellow and red equipment and tubes.
The picture shows a fold-out red set of experiment materials on the topic of water. It contains various containers, tubes, a manual and other utensils that can be used for practical experiments in educational settings.
The picture shows a student set for experimenting with water, presented by Cornelsen Experimenta. In the foreground you can see children carrying out various experiments together, demonstrating curiosity and teamwork.
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The picture shows a collection of transparent containers with yellow lids and red inserts. The containers are arranged symmetrically and stand on a green base, which gives a fresh, three-dimensional impression.
The picture shows an arrangement of test tubes in a red holder and a green set of laboratory equipment, including pipettes and plates. In the foreground is a container with a label for chemicals.
The picture shows instructions on the topic "Rainwater becomes groundwater" with a schematic representation of the water cycle. The steps described explain how invisible water drops evaporate and turn into clouds and finally into rain
The picture shows instructions from an experiment booklet entitled “Station A3: Drilling deep into the earth”. It lists materials such as filter tubes and various fillers that are needed for the experiment.
The picture shows instructions for a soil type test experiment that requires materials such as a built-up filter, plastic cups and spoons. It is part of a teaching material for understanding water and soil in the German education system.
The picture shows an experiment set with various tools, including a transparent tube, a corresponding container and a spoon. There is also a manual that contains instructions for conducting experiments.
The picture shows a red experiment kit from Cornelsen, which is designed for educational purposes in the field of water analysis. The set is called "Water 1" and contains materials for examining drinking water and wastewater.
In the picture, children in a classroom are experimenting with different materials in clear containers. They add water to the containers and observe the results, with their curiosity and cooperation clearly visible.
The picture shows children experimenting with different containers in a classroom. They appear to be conducting an experiment in which they layer different materials into transparent cylinders and observe them.
The picture shows two children looking fascinated at an experiment kit that appears to show different layers of materials. The kit consists of transparent containers containing differently colored substances and
The picture shows three children holding two glass flasks filled with water, connected by a tube. They are experimenting and probably observing a physical phenomenon, while a friendly learning atmosphere
In the picture, three children are experimenting with water in glass containers and a hose. They seem to be watching with interest how the water in the containers acts, which promotes interactive learning.

item number 31802

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Technical specifications

Size of kit: 540 x 450 x 150 mm

With this experiment, children learn how and where groundwater forms.


In the following four experiments, the children recognize that only the clay/loam holds back the water, while the other types of soil let it through and store it. The different rate at which the water seeps away depending on the type of soil is an additional observation.


The children realize that the rainwater ends up being clean, although it should be "dirty" because of the soil it flows through. However, they also recognize that this filtering process does not work with substances that humans bring in, e.g. B. salt, oil, detergent and paint. Students can later conclude that groundwater needs to be protected from such contaminants.


In connection with the formation of groundwater, the formation of rain is also of interest, because this is the only way to close the cycle. All attempts to do this in elementary school have the disadvantage that they only partially represent the processes in a model-like manner and require patience.


With this experiment, which requires a little handicraft work, children can get an idea of ​​how a fountain is built and how it works in principle.


The children get an idea of ​​how the pressure has to be generated with which the drinking water itself reaches the taps in high-rise buildings. One option is to use pumps that have to run constantly. The second option is to first pump the water into a container that is higher than the taps.


Children who have engaged in this experiment should understand why the materials mentioned (and others) must be kept out of the wastewater. Even with our “clean” materials, it is not a pleasant task to have to separate them from the water.


We use edible oil because in reality, like all other edible fat residues, it is removed during washing, but is not eliminated as such and therefore has a share in the sewage treatment plant work. The same goes for the toilet paper. As a result, disposal after the experiment is also easy: it can be done with the waste water.


  • 15 ×
  • 1 ×
  • 15 × Teaspoon
  • 15 × Fine sieve (copper wire mesh)
  • 1 × Coloring agent blue (food color)
  • 15 ×
  • 1 ×
  • 7 ×
  • 2 ×
  • 1 × Connecting tube, transparent, 65 cm
  • 15 ×
  • 1 × Plastic box 140/50/35 mm
  • 15 ×
  • 15 ×
  • 15 × Plastic beaker, 250 ml, with scale
  • 15 ×
  • 1 × Storing diagram,int.vers.
  • 1 × Foam insert for 31802
  • 1 × Lidfoam grey,515x355x10mm
  • 15 ×