https://www.youtube.com/watch?v=BaCOlRlw3K4
Published on Feb 17, 2010
Capture the rain! (Now legal in Washington state). A quick look at roof water harvesting using a slow sand filter combined with a diverter. This is an overview of the procedure and a demonstration of a working system. An instructional video on how to build a system can be found here: http://www.youtube.com/watch?v=S-_RDB… As of September 18, 2016 this filter is still running and producing clean water. The sand has not been changed. See http://www.slowsandfilter.org and http://www.shared-source-initiative.c… for lots more information on these filters. Also http://www.roofwaterharvesting.org and http://www.enlight-inc.com/blog/ are two sites that have detailed instructions on how to build one of these filters. Do your own water testing: https://www.micrologylabs.com/categor… What kind of sand to use: http://www.enlight-inc.com/blog/?m=20… http://www.enlight-inc.com/blog/?m=20… The water test results from this filter (called filer 1) can be found at our website here: http://slowsandfilter.org/results_fou… Scroll about half way down the page. There’s lots of info there, and more than just one test has been done. The filter works.
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[Science & Technology](https://www.youtube.com/channel/UCiDF_uaU1V00dAc8ddKvNxA)
