| 1. | It soon became apparent that slow sand filters could remove typhoid germs.
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| 2. | The sketch illustrates the general structure of a rapid pressure sand filter.
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| 3. | He illustrated water filtration experiment by using three pairs of sand filters.
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| 4. | Traces of Legionella bacteria were found in sediment in the sand filter.
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| 5. | Rapid sand filters and controls on the left . " National Archives, 293652
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| 6. | In La Fortuna, the group utilized a slow sand filter in its system.
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| 7. | Considerable uncertainty is involved regarding models used to construct sand filters.
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| 8. | Sand filters are occasionally used in the treatment of nitrates, into nitrogen gas.
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| 9. | Some households had to resort to sand filters to treat water in their homes.
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| 10. | She teaches the construction of bio-sand filters and water tanks.
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