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2. Water softening - Wikipedia

   en.wikipedia.org/wiki/Water_softening

   Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted bonding with calcium ions. Soft water also extends the lifetime of plumbing by reducing or eliminating scale build-up in pipes and fittings.

3. 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 ...

4. Fishing techniques - Wikipedia

   en.wikipedia.org/wiki/Fishing_techniques

   Some fishing spears use slings (or rubber loops) to propel the spear. A Hupa man with his spear. Bowfishing - uses a bow and arrow to kill fish in shallow water from above. Gigging - uses small trident type spears with long handles for gigging bullfrogs with a bright light at night, or for gigging suckers and other rough fish in shallow water.

5. Ozark (TV series) - Wikipedia

   en.wikipedia.org/wiki/Ozark_(TV_series)

   Ozark is an American crime drama television series created by Bill Dubuque and Mark Williams for Netflix and produced by MRC Television and Aggregate Films. The series stars Jason Bateman and Laura Linney as Marty and Wendy Byrde respectively, a married couple who move their family to the Lake of the Ozarks to continue their work laundering money for a Mexican drug cartel.

6. Water purification - Wikipedia

   en.wikipedia.org/wiki/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 for a variety of ...

7. Self-cleaning surfaces - Wikipedia

   en.wikipedia.org/wiki/Self-cleaning_surfaces

   A) A superhydrophobic surface with a high contact angle nearing 180 degrees. B) A surface with a low water sliding angle. C) A surface with a higher sliding angle which will be less efficient when self-cleaning water from its surface. Control over surface wettability is a critical aspect of self-cleaning surfaces.