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Image: Rapid sand filter EPA

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Description: Illustration (cutaway view) of rapid sand filter for water purification
Title: Rapid sand filter EPA
Credit: "Technologies for Upgrading Existing or Designing New Drinking Water Treatment Facilities", Document no. EPA/625/4-89/023. p. 36, Figure 4-2.
Author: US Environmental Protection Agency
Permission: 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. English | eesti | italiano | македонски | Nederlands | polski | português | slovenščina | українська | 中文 | 中文（简体）‎ | +/−
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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