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2. LifeSaver bottle - Wikipedia

   en.wikipedia.org/wiki/LifeSaver_bottle

   To filter the water, one puts contaminated water in the back of the bottle, then screws the lid on. The lid has a built in pump which is operated manually with a hand; the pumping action forces the contaminated water through the nano-filter and safe drinking water collects in another chamber in the bottle. The drinker then opens the top of the ...

3. Bank filtration - Wikipedia

   en.wikipedia.org/wiki/Bank_filtration

   Chemical filtration or ion exchange may take place when aquifer soils react with soluble chemicals in the water. [3] Most 'normal' contaminants (microbial organisms and inorganic or organic pollutants) will be removed by bank filtration, either because they get filtered out by the sand/earth of the bank, or because the passage time (which may ...

4. Biosand filter - Wikipedia

   en.wikipedia.org/wiki/BioSand_Filter

   The high water level (hydraulic head) in the inlet reservoir zone pushes the water through the diffuser and filter, then decreases as water flows evenly through the sand. The flow rate slows because there is less pressure to force the water through the filter. The inlet water contains dissolved oxygen, nutrients, and contaminants.

5. Diatomaceous earth filtration - Wikipedia

   en.wikipedia.org/wiki/Diatomaceous_earth_filtration

   Pressure filter systems have a water inlet and outlet with the inlet site at the top and the water outlet at the base of the filter. As the water flows through water inlet, it will encounters a grid assembly covered in synthetic cloth which provides support for the diatomaceous earth cake. [ 19 ]

6. Slow sand filter - Wikipedia

   en.wikipedia.org/wiki/Slow_sand_filter

   As water passes through the hypogeal layer, particles of foreign matter are trapped in the mucilaginous matrix and soluble organic material is adsorbed. The contaminants are metabolised by the bacteria, fungi and protozoa. The water produced from an exemplary slow sand filter is of excellent quality with 90–99% bacterial cell count reduction ...

7. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!