Category Archives: slow sand water filter study and construction

Water molecules have now been shown to have a fourth “state of matter”

A recent article in “Science World Report” explains how scientists have found a new property of water molecules. A close examination of this information may give new clues as to how a slow sand water filter actually works on the … Continue reading

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An update on rain water harvesting in Colorado

Colorado appears to be coming around regarding their laws on rain water harvesting.  Its about time given the results of this study which shows that residential home owners catching rain in 55 gallon barrels does not adversely effect the amount of … Continue reading

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Urban runoff kills salmon

Update July 18, 2016: Please refer to the comment below by Nat. There is a link to the original study. Here is a very good reason to set up rain barrels, and slow sand filters. Urban runoff is killing salmon.  It has been … Continue reading

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Regarding water, do trees make a difference?

This study, published in 2008, explains how trees in boreal forests help to form clouds. Boreal forests are found in the northern hemisphere. Pine trees, larch trees, and other conifers make up the majority of types of trees found in … Continue reading

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Think about water

An update regarding our ongoing work on slow sand filters. All of the filters here are still working. The oldest, filter 1, is working after 8 continuous years running. Filters 2, 3, 4, and 5 are still working. Here in … Continue reading

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Cryptosporidium in swimming pools

A recent news article has warned of cryptosporidium parasites in pool water.  Another article warns of the same problem. These microbes cannot be removed or killed effectively by the use of chlorine. Ozone is effective but requires high concentrations of the chemical … Continue reading

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Drought conditions declared in Washington state

Back in February of this year we wrote about the lack of snow in the Cascade mountains in Washington state. We hoped for more snow – that did not happen. Now the situation is worse. Let’s hope there is not … Continue reading

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A five gallon slow sand water filter

Last year and the year before, we did some work on five gallon slow sand filters. http://www.enlight-inc.com/blog/?p=1395 http://www.enlight-inc.com/blog/?p=1740 http://www.enlight-inc.com/blog/?p=1848 http://www.enlight-inc.com/blog/?p=1927 http://www.enlight-inc.com/blog/?p=2052 http://www.enlight-inc.com/blog/?p=2089 http://www.enlight-inc.com/blog/?p=2179 We set up 3 of them, ran them for a year and a half, and tested the … Continue reading

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De-chlorinate water with vitamin C

Chlorine can be removed from water by adding vitamin C to it. This could be a way to facilitate filtering tap water with a slow sand water filter. The chlorine in tap water makes using a biological sand water filter … Continue reading

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The Seattle area may face water supply issues

Update, May 15: 44 percent of Washington state is in drought emergency condition From the department of ecology’s website: “24 of Washington’s river basins are in a declared drought emergency.” Some of our neighbors, who are on public water systems, … Continue reading

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