Author Archives: Orpheus

Update on filter 4, and 5

Filter 5, the newest addition to the project, has been filtering water since the last major below freezing weather event (about 6 weeks) using only gravity feed, and manual re-circulation using a 5 gallon container. No electrical power or pumps … Continue reading

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Rainwater harvesting regulations state by state

Update; September 16, 2016:   We have been getting some posts documenting the harassment of citizens by local authorities in regards to collecting rain water.  I’ve checked these out to the best of my ability, and found most of them to … Continue reading

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Water quality tests on filter 4

Above are the tests on filter 4 after 3 weeks of running, following being frozen solid for the month of January, 2013. The filter has not had enough water running through it to completely restore the active bio-layer. The roof … Continue reading

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Backwashing a slow sand filter

A few notes here about backwashing  a small slow sand filter. This mainly applies to DIY (Do It Yourself) filters, with one exception noted below in the next paragraph.  Do not forcefully backwash your DIY slow sand filter. You may very well … Continue reading

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Water quality tests on a DIY slow sand filter

The filters described on this blog and the associated websites have been tested by 2 different EPA certified laboratories: AmTest in Kirkland Washington, and The city of Everett, Washington environmental lab The test results can be found here and here. … Continue reading

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Tests on a slow sand filter after freezing and thawing

Filter 5 was frozen solid and not running for 2 weeks in January of this year (2013). Before that for 5 days the filter froze at night, and then ran for 6 hours each day. As of Jan 25 the … Continue reading

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slow sand filters in freezing weather: update

All but two of the filters have been frozen solid for 2 weeks (15 days), with the exception of the two filters that purify shallow well water. The water that runs through them has been running continuously and was still … Continue reading

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Will a slow sand water filter survive freezing weather?

The filters we work on here in western Washington state have been in operation outdoors through temperatures as low as 15 degrees F (at night) for as long as 1 week, with below freezing (32 degrees F) continuously for 7 … Continue reading

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How to know if a slow sand filter I see on the web will actually work when I build it

There are more and more websites and YouTube videos appearing on the internet showing how to “build your own slow sand filter”. Some of the videos have what appear to be very impressive results; but be cautious. The correct functioning of … Continue reading

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Slow sand filters in below freezing weather

The temps have been 28 degrees F at night for the past 4 days now. All the filters have frozen up at night, and thawed out during the day. Last night, Jan 2/3 was the coldest so far, 25 degrees … Continue reading

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