# Screen filter

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> Source: https://en.wikipedia.org/wiki/Screen_filter
> Source revision: 1345981383
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{{short description|Filter to remove macroscopic contaminants from water}}

{{for|a device that fits over a computer screen|monitor filter}}

thumb|Filter screen

A '''screen filter''' is a type of [water purification](/source/water_purification) using a rigid or flexible screen to separate [sand](/source/sand) and other fine particles out of water for [irrigation](/source/irrigation) or industrial applications.<ref>{{cite book
 | last1     = Whiting
 | first1    = Joanne E. Drinan
 | editor    = Nancy E.
 | title     = Water and Wastewater Treatment a Guide for the Nonengineering Professionals
 | date      = 2000
 | publisher = CRC Press
 | location  = Hoboken
 | isbn      = 9781420031799
 | page      = 62
 | url       = https://books.google.com/books?id=2z24NRadPMkC&pg=PA62
}}</ref>  These are generally not recommended for filtering out organic matter such as [algae](/source/algae), since these types of contaminants can be extruded into [spaghetti](/source/spaghetti)-like strings through the filter if enough pressure drop occurs across the filter surface.  Typical screen materials include [stainless steel](/source/stainless_steel) ([mesh](/source/mesh)), [polypropylene](/source/polypropylene), [nylon](/source/nylon) and [polyester](/source/polyester).{{citation needed|date=September 2023}}

== Use ==

Self-cleaning screen filters incorporate an automatic backwash cycle to overcome these limitations.{{which|date=September 2024}} Backwash cycles are far more frequent when compared to a media filter with similar capacity, and each backwash requires far less water to perform. Their ability to quickly remove contaminants from water before they leach their nutrients make such filters popular choices for recirculating aquaculture systems. They have also become popular in closed loop industrial systems such as cooling tower, heat exchanger, and other equipment protection applications. Similar devices with larger openings designed only to keep out large objects are called [strainer](/source/strainer)s.{{citation needed|date=January 2013}}

Stainless-steel strainers are used in industrial, municipal, and [irrigation](/source/irrigation) applications, and can be designed for very high flow rates. When paired with a controller and flush valve, a strainer can be fully automated. Suspended particles collect on the inside of the screen, and the flush valve opens to expel the buildup. This eliminates the need for manual cleaning of the strainer element.{{citation needed|date=September 2023}}

==See also==
* [Traveling screen](/source/Traveling_screen)

==References==
{{reflist}}

{{DEFAULTSORT:Screen Filter}}
Category:Water treatment
Category:Filters
Category:Irrigation
Category:Water technology

{{Watersupply-stub}}

[eo:Ĝermolisto de hidraŭliko#Reta filtrilo](/source/eo%3A%C4%9Cermolisto_de_hidra%C5%ADliko)

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Adapted from the Wikipedia article [Screen filter](https://en.wikipedia.org/wiki/Screen_filter) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Screen_filter?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.