Slow_sand_filter_EPA.jpg
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Summary
Description Slow sand filter EPA.jpg | |||||||
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
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Licensing
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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
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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/ PDM Creative Commons Public Domain Mark 1.0 false false