sand and filters

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• Sand — For other uses, see Sand (disambiguation). Close up of sand from the Gobi Desert, Mongolia, showing a surface area of 1 square centimetres …   Wikipedia

• Sand filter — Sand filters are used for water purification. There are three main types; # rapid (gravity) sand filters # upflow sand filters # slow sand filters All three methods are used extensively in the water industry throughout the world. The first two… …   Wikipedia

• Slow sand filter — Slow sand filters are used in water purification for treating raw water to produce a potable product. They are typically 1 to 2 metres deep, can be rectangular or cylindrical in cross section and are used primarily to treat surface water. The… …   Wikipedia

• Rapid sand filter — The rapid sand filter or rapid gravity filter is a type of filter used in water purification and is commonly used in municipal water treatment facilities. Rapid sand filters use relatively coarse sand and other granular media to remove particles… …   Wikipedia

• Kalkaska Sand — is the official soil of the U.S. state of Michigan.Kalkaska Sand was identified in 1927 and named after Kalkaska County located in the northern Lower Peninsula of Michigan. This soil is a multi layer soil composed of humus, light sand, dark sand …   Wikipedia

• Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics       Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity.       Computer scientist Manindra Agrawal of the… …   Universalium

• meteor and meteoroid — ▪ astronomy Introduction   respectively, a glowing streak in the sky (meteor) and its cause, which is a relatively small stony or metallic natural object from space (meteoroid) that enters Earth s atmosphere and heats to incandescence. In modern… …   Universalium

• engine air filters — Filters designed to prevent induction of dust and sand into the engine to prevent undue engine wear …   Aviation dictionary

• Blue Future Filters Inc — [http://www.bluefuturefilters.com Blue Future Filters Inc.] is an American water filter company that markets non chemical and low tech drinking water systems that are economical, efficient, appropriate, and available to a wide variety of… …   Wikipedia

• Puerto Rican scientists and inventors — The discoveries and contributions which have been made by Puerto Rican scientists and inventors in their respective fields have impacted the way of life of the inhabitants of Puerto Rico, and in many cases society in general. Hundreds of years… …   Wikipedia

• Dr. Jekyll and Mr. Hyde (1931 film) — Dr. Jekyll and Mr. Hyde Theatrical Poster Directed by Rouben Mamoulian Produced by …   Wikipedia