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2. Backwashing (water treatment) - Wikipedia

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

   Backwashing is a form of preventive maintenance so that the filter media can be reused. In water treatment plants, backwashing can be an automated process that is run by local programmable logic controllers (PLCs). The backwash cycle is triggered after a set time interval, when the filter effluent turbidity is greater than a treatment guideline ...

3. Perm (hairstyle) - Wikipedia

   en.wikipedia.org/wiki/Perm_(hairstyle)

   Afro permanent on a male resident of Miami Beach in 1972. A permanent wave, commonly called a perm or permanent (sometimes called a "curly perm" to distinguish it from a "straight perm"), [1] is a hairstyle consisting of waves or curls set into the hair. The curls may last a number of months, hence the name.

4. List of hairdressers - Wikipedia

   en.wikipedia.org/wiki/List_of_hairdressers

   Legros de Rumigny (1710–1770) — French court hairdresser. Léonard (c. 1751–1820) — hairdresser to the French court. [1][4] Marcel Grateau (1852–1936) — inventor of the Marcel wave in the 1870s, although it was most popular in the 1920s. [1] Franz Ströher (1854–1936) — German hairdresser, company founder of Wella.

5. Leonard of Mayfair - Wikipedia

   en.wikipedia.org/wiki/Leonard_of_Mayfair

   Leonard Lewis (15 June 1938 [1] – 30 November 2016), known professionally as Leonard of Mayfair, was a British hairdresser, credited with creating the haircut that launched the career of prominent 1960s model Twiggy as well as establishing the careers of other successful British hairdressers, including John Frieda, Daniel Galvin, Nicky Clarke, Keith Wainwright and Michael Gordon. [2]

6. Hair washing - Wikipedia

   en.wikipedia.org/wiki/Hair_washing

   Hair washing is the cosmetic act of keeping hair clean by washing it. To remove sebum from hair, some apply a surfactant, usually shampoo (sometimes soap) to their hair and lather the surfactant with water. The surfactant is rinsed out with water along with the dirt that it bonds to. Furthermore, there are dry shampoos; powders that remove ...

7. Regular haircut - Wikipedia

   en.wikipedia.org/wiki/Regular_haircut

   Regular haircut. Actor Don Grady sporting a regular haircut. A regular haircut in Western fashion is a men's and boys' hairstyle featuring hair long enough to comb on top, with a defined or deconstructed side part, and back and sides that vary in length from short, semi-short, medium, long, to extra long. [1]: 129–131 [2]: 98–101 The style ...