Monthly Archives: January 2013

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.┬áThe 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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