Aha Trivia Stuff Everyone Should Know
Aha Trivia: Stuff Everyone Should Know · ahatrivia.com/mb-wilderness-survival-9a3068007405

What does the zoogleal layer on a slow sand filter do?

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  1. It heats the water
  2. It biologically treats the water
  3. It adds chlorine to the water

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References

  1. Water purification en.wikipedia.org/wiki/Water_purification Checked 2026-11-07.

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