Author Archives: filter_guy

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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Five gallon slow sand filter update

We found the 5 gallon slow sand filter design to be inferior to the 55 gallon design. The five gallon filters just don’t work as well. They are less efficient at removing biological contamination at best; and actually introduce contamination … Continue reading

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Slow sand water filter sand source

When constructing a slow sand water filter, make sure the sand used is not contaminated. Make sure the sand source provides the correct type of sand. Running some chlorinated water through the filter before starting it running with unfiltered water … Continue reading

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Rain water harvesting update

Filters 1, 2, 3, 4, and 5 are still operating and producing clean water. The three pond filters are also still operating. Filter 1 was started in 2007. We are working on a pdf that has the most usefull information … Continue reading

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