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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)

   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. Perms may be applied using thermal or chemical means.

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. 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 ...

6. Sand filter - Wikipedia

   en.wikipedia.org/wiki/Sand_filter

   Nomal operating flux and pressure drop are between 3-7 gpm/ft2 and 3-7 psi. When pressure drop increases above 10 psi, a backwash operation ins needed, which consist of reversing the flow (water goes upwards) in order to remove the particles trapped in the filtering media, and this will exit from the top of the filter with the backwash water.

7. Emergency eyewash and safety shower station - Wikipedia

   en.wikipedia.org/wiki/Emergency_eyewash_and...

   A safety shower is a unit designed to wash an individual's head and body which has come into contact with hazardous chemicals. Large volumes of water are used and a user may need to take off any clothing that has been contaminated with hazardous chemicals. Safety showers cannot be used for flushing an individual's eyes, due to the high pressure ...