This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help.
Summary
DescriptionSlow sand filter EPA.jpg
English: Diagram of a housed slow sand filter for water purification
Date
Source
"Technologies for Upgrading Existing or Designing New Drinking Water Treatment Facilities", Document no. EPA/625/4-89/023. p. 40, Figure 4-7.
Author
US Environmental Protection Agency
Permission (Reusing this file)
Public domainPublic domainfalsefalse
This image (or other media) is a work of an Environmental Protection Agency employee, taken or made as part of that person's official duties. As works of the U.S. federal government, all EPA images are in the public domain.
العربية ∙ Deutsch ∙ English ∙ eesti ∙ italiano ∙ 日本語 ∙ македонски ∙ Nederlands ∙ polski ∙ português ∙ sicilianu ∙ slovenščina ∙ ไทย ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/−
Licensing
Public domainPublic domainfalsefalse
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
Captions
Add a one-line explanation of what this file represents
Items portrayed in this file
depicts
inception
March 1990
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time
Thumbnail
Dimensions
User
Comment
current
03:57, 28 March 2010
2,115 × 1,187 (189 KB)
Moreau1
== Summary == {{Information |Description={{en|1=Diagram of a housed slow sand filter for water purification}} |Source=[http://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=300048WU.txt "Technologies for Upgrading Exis
File usage
The following pages on the English Wikipedia use this file (pages on other projects are not listed):