Kabrhel's Index

From WikiLectures

English: Kabrhel's Index
Czech: Kabrhelův index

Kabrhels index is number of microbes, which passes through the sand filter. Limit is 1:7000 (it means that 1 microbe from 7000 microbes will pass).

Note: Gustav Kabrhel (1857–1939) was the founder of hygiene in the Czech Republic.

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