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2. Swimming pool sanitation - Wikipedia

   en.wikipedia.org/wiki/Swimming_pool_sanitation

   Two distinct and separate methods are employed in the sanitation of a swimming pool. The filtration system removes organic waste on a daily basis by using the sieve baskets inside the skimmer and circulation pump and the sand unit with a backwash facility for easy removal of organic waste from the water circulation.

3. 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.

4. Backwash - Wikipedia

   en.wikipedia.org/wiki/Backwash

   Backwash ileitis, the involvement of the terminal part of the ileum in ulcerative colitis, following the ascent of the condition from the rectum Backwashing (water treatment) , the process of thoroughly cleaning a pool filter pump by reversing the flow of water through it with the dirt and rinse water going to waste

5. Depth filter - Wikipedia

   en.wikipedia.org/wiki/Depth_filter

   Once the filter medium has reached its maximum solute load the cartridge is discarded. Backwashing can make the filter complete more cleaning cycles Home water and pool filters Industrial separations for hydrocarbon fuels [6] Deep bed (sand filter) [3] The filter medium has the solution on top and utilizes gravity to filter particles.

6. Media filter - Wikipedia

   en.wikipedia.org/wiki/Media_filter

   Periodically, a backwash may be initiated to remove the solids trapped in the bed. During backwash, flow is directed in the opposite direction from normal flow. In multi-media filters, the layers in the media re-stratify due to density differences prior to resuming normal filtration.

7. Water softening - Wikipedia

   en.wikipedia.org/wiki/Water_softening

   Backwash: Water is directed through the resin in the direction opposite to that of normal flow, and the output is sent to a drain for disposal. This ten-minute process flushes out solids, and expands the resin bed.