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Principle
The impurities are filtered out by the different layers in the pipe. On the shore of a river or lake, a similar soil stratification is present. From top to bottom, it typically consists of humus, sand, gravel and stones. Below this follows a layer that is impermeable to water.
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(en) Experiment guide
p9160100e .pdf
File size 1.27 Mb
pdf
(de) Versuchsbeschreibung
p9162200_de .pdf
File size 0.88 Mb
pdf
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