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| Contaminants
in septic |
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| systems: Pathogens |
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| z | Viruses probably
move more easily than |
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| bacteria |
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| z | Recent study:
Viruses moved within 11 |
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| hours from
toilet through septic tank and |
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| drainfield and
into environment |
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| z | Excreted at
1,000,000 per gram |
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| z | Typical virus
survival: 67 days |
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