File:Slow sand filter EPA.jpg

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Summary

Description
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 domain
Public domain
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.
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Licensing

Public domain
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.

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March 1990

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Date/TimeThumbnailDimensionsUserComment
current03:57, 28 March 2010Thumbnail for version as of 03:57, 28 March 20102,115 × 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

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