The backward flowing air within the wash of an airplane, caused mostly by the engine.
The backwards movement of water back down the beach after a wave has broken and advanced. swash longshore drift
Reversed flow through a filter medium to remove filtered solids.
The gravity-driven flow of water back down the slope of a beach.
To reverse flow air, steam, or fluid through the medium to effect solids removal. Sometimes referred to as blowback.
The seaward rush of water down a beach that occurs with a receding wave.
a means of cleaning which involves reversing the flow of water through the filter, forcing the water and dirt out a "waste" line. This is done by setting the backwash valve to the backwash position. NOTE: never adjust this valve when the pump is running
cleaning water treatment filters by reversing the water flow.
A stage in the regeneration cycle of a softener or other ion-exchanger equipment during which water-flow through the unit is directed upwards through the resin bed. This is done to clean and reclassify the bed following exhaustion.
Water movement against the primary direction of flow.
A term used to describe reflected waves from a steep-to shoreline.
the reversing of the flow of water through the filter and sending it to waste. This procedure will thoroughly flush the filter, media and components. Follow the manufacturer's instructions! Not all filters are routinely backwashed. Sand filters should not be backwashed excessively: pay attention to the pressure gauge and vacuum whenever conditions indicate the need.
Reversing the flow of water through the filter to clean the elements and filter medium. Typical part of maintenance for sand filters and some DE filters.
the flow of air that is driven backwards by an aircraft propeller
the wave that spreads behind a boat as it moves forward; "the motorboat's wake capsized the canoe"
The process of thoroughly cleansing the filter media and/or elements, and the contents of the filter vessel.
The seaward return flow of swash on the beach face due to gravity.
Reversal of a fluid flow through the filtration media to remove solids from the filter . . to clean or regenerate a filter.
Motion in the water caused by propellers moving in a reverse direction.
when drinking water is treated by filtration, the filter eventually becomes clogged with particles. The water is then pumped back through the filter (backwash) to flush out the particles. The washwater is then sent to a wastewater treatment plant.
The process of cleaning particulate matter out of the filter media by reversing the flow of water.
The processes of cleaning by forcing air and water upwards through a filter which flushes out the trapped material in the filter.
Reversing the flow of water through a filter to clean it of accumulated dirt and debris.
The process of thoroughly cleaning the filter medium and/or elements by the reverse flow of water.
A process whereby the circulation through a filter is reversed to waste, to flush away contaminants. It should be done weekly in commercial pools or regularly but less frequently in domestic pools depending upon bather load. It should also be carried out if the pressure loss across the filter is greater than that recommended by the filter manufacturer. With sand filters, the backwash pressure should be great enough to disturb the sand ("fluidised bed"). Generally this carried out with no bathers in the pool. With sand filters, it is good practice after backwashing to run in the normal flow direction to waste to allow the sand bed to settle. The discharge from commercial pools is classified as trade effluent and a discharge consent must be obtained from the appropriate discharge authority.
the process of cleansing the filter medium and/or elements by the reverse flow of water through the filter. (N)
The seaward return of the water following the uprush of the waves. Also called backrush or run down.
The process of cleaning the filter medium and elements by reversing the flow of water through the filter - and thereby flushing accumulated debris out of the filter.
The return flow of water down a beach after a wave has broken.
Reversal of water or solution's flow through a filtration system. Backwash process is commonly used in sand and multi-media filters.
A process of flushing fluid or water through a filtration component or media to wash out potential blockages or decompact
Process of running water through a filter opposite the normal direction of flow to flush out contaminants.
The process of thoroughly cleaning the filter by reversing the flow of water through it with the dirt and rinse water going to waste.
Disturbed water, caused by propeller action when ship is reversing
The process of cleaning the filter medium or septum by reversing the flow of water through the filter.
The upward flow of water through a resin bed to clean the resins, and in the case of a mixed bed, to separate anion and cation resins.
The process in which beds of tiler or ion exchange media are subjected to a flow in the opposite direction to loosen the bed and to flush suspended matter collected on the media.
The process of cleaning the swimming pool filter by reversing the water flow.
Thoroughly cleaning a sand filter by reversing the flow of water through it so that the dirt and rinse water go to waste.
The return water flow of swash. This sheet of water flows back to ocean because of gravity.
The cleaning of the filtration system in a swimming pool
The return flow of water down the beach as a result of wave action; the opposite of swash.
Reversing the flow of liquid through a filter in order to remove trapped solids.
The process in which beds of filter or ion exchange media are subjected to flow opposite to the service flow direction to thoroughly expand the bed to flush particulate matter collected during the service run.
Backwash is the backwards flow of air or water. Backwash can be created naturally by waves rebounding off a beach or other obstacle. It is created by propulsion devices such as an oar or engine.
