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2. Water filter - Wikipedia

   en.wikipedia.org/wiki/Water_filter

   A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process. Filters cleanse water to different extents, for purposes such as: providing agricultural irrigation, accessible drinking water, public and private aquariums, and the safe use of ponds and swimming pools .

3. Water purification - Wikipedia

   en.wikipedia.org/wiki/Water_purification

   Water purification. Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids, and gases from water. The goal is to produce water that is fit for specific purposes. Most water is purified and disinfected for human consumption ( drinking water ), but water purification may also be carried out ...

4. Clean air delivery rate - Wikipedia

   en.wikipedia.org/wiki/Clean_Air_Delivery_Rate

   The AHAM-certified seal lists a rating for tobacco smoke, pollen, and dust removal, and a rating for room size. The clean air delivery rate ( CADR) is a figure of merit that is the cubic feet per minute (CFM) of air that has had all the particles of a given size distribution removed. For air filters that have air flowing through them, it is the ...

5. Slow sand filter - Wikipedia

   en.wikipedia.org/wiki/Slow_sand_filter

   Slow sand filter. Slow sand filters are used in water purification for treating raw water to produce a potable product. They are typically 1–2 m (3.3–6.6 ft) deep, can be rectangular or cylindrical in cross section and are used primarily to treat surface water. The length and breadth of the tanks are determined by the flow rate desired for ...

6. Carbon filtering - Wikipedia

   en.wikipedia.org/wiki/Carbon_filtering

   Carbon filtering is commonly used for water purification, air filtering and industrial gas processing, for example the removal of siloxanes and hydrogen sulfide from biogas. It is also used in a number of other applications, including respirator masks, the purification of sugarcane, some methods of coffee decaffeination, and in the recovery of ...

7. Drinking water quality standards - Wikipedia

   en.wikipedia.org/wiki/Drinking_water_quality...

   Drinking water standards include lists of parametric values, and also specify the sampling location, sampling methods, sampling frequency, analytical methods, and laboratory accreditation ( AQC ). In addition, a number of standards documents also require calculation to determine whether a level exceeds the standard, such as taking an average.