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2. Sand filter - Wikipedia

   en.wikipedia.org/wiki/Sand_filter

   Sand filters are used as a step in the water treatment process of water purification . There are three main types; rapid (gravity) sand filters, upward flow sand filters and slow sand filters. All three methods are used extensively in the water industry throughout the world. The first two require the use of flocculant chemicals to work ...

3. Cloth filter - Wikipedia

   en.wikipedia.org/wiki/Cloth_filter

   The woman on the right is putting a sari filter onto a water-collecting pot (or kalash) to filter water for drinking. A cloth filter is a simple and cost-effective appropriate technology method for reducing the contamination of drinking water, developed for use mainly in Bangladesh. Water collected in this way has a greatly reduced pathogen count.

4. Category:Water filters - Wikipedia

   en.wikipedia.org/wiki/Category:Water_filters

   C. Ceramic water filter. Chamberland filter. Coffee filter. Copper zinc water filtration. Cross-flow filtration.

5. Pur (brand) - Wikipedia

   en.wikipedia.org/wiki/PUR_(brand)

   Pur's products include water filter faucet mounts, pitchers, side taps, dispensers, coolers, and filtration systems for Kenmore refrigerators of Sears Holdings Corporation. History [ edit ] The Pur brand was created and products invented by Minneapolis -Based Recovery Engineering, Inc., which was sold to Procter & Gamble in 1999 for ...

6. Berkefeld filter - Wikipedia

   en.wikipedia.org/wiki/Berkefeld_filter

   Berkefeld filter. A Berkefeld filter [1] is a water filter made of diatomaceous earth ( Kieselguhr ). It was invented in Germany in 1891, and by 1922 was being marketed in the United Kingdom by the Berkefeld Filter Co. [2] Berkefeld was the name of the owner of the mine in Hanover, Germany, where the ceramic material was obtained.

7. Inland waterways of the United States - Wikipedia

   en.wikipedia.org/wiki/Inland_waterways_of_the...

   Not all waters have had these facts determined, and so are of uncertain status. All water subject to tides are included. Note that the "Navigable Waters of the United States" listed in 33 CFR 329 are different than those listed as "Waters of the United States" in 33 CFR 328, which is the Clean Water Rule. However, all Navigable Waters, plus ...