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2. Backwashing (water treatment) - Wikipedia

   en.wikipedia.org/wiki/Backwashing_(water_treatment)

   Backwashing cycle is run on the left filter of the test columns in a water filtration plant. [1]In terms of water treatment, including water purification and sewage treatment, backwashing refers to pumping water backwards through the filters media, sometimes including intermittent use of compressed air during the process.

3. Rapid sand filter - Wikipedia

   en.wikipedia.org/wiki/Rapid_sand_filter

   Cutaway view of a typical 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 drinking water facilities as part of a multiple-stage treatment system. [1]

4. Interference filter - Wikipedia

   en.wikipedia.org/wiki/Interference_filter

   Dichroic filters use the principle of thin-film interference, and produce colors in the same way as oil films on water.When light strikes an oil film at an angle, some of the light is reflected from the top surface of the oil, and some is reflected from the bottom surface where it is in contact with the water.

5. Pur (brand) - Wikipedia

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

   Pur (styled PŪR; pronounced as "pure") is a division of Helen of Troy Limited that produces Pur Water products. Pur's products include water filter faucet mounts, pitchers, side taps, dispensers, coolers, and filtration systems for Kenmore refrigerators of Sears Holdings Corporation.

6. Permeability (materials science) - Wikipedia

   en.wikipedia.org/wiki/Permeability_(Materials...

   The SI unit for permeability is the square metre (m 2).A practical unit for permeability is the darcy (d), or more commonly the millidarcy (md) (1 d 10 −12 m 2).The name honors the French Engineer Henry Darcy who first described the flow of water through sand filters for potable water supply.

7. Coupons.com - Wikipedia

   en.wikipedia.org/wiki/Coupons.com

   The platform continues to offer printable coupons alongside digital coupons, [6] along with product reviews and deals through its Smart Shopper section. It has a team of over 40 experts that review coupons and shopping vouchers that are published and approved on the website. [7] In June 2011, Coupons.com's value was estimated at $1 billion. [8]