Monthly Archives: February 2012

Feb. 28 6:30 AM PST: The output water directly from the filter is now perfectly clear based on visual inspection. The filter did not freeze last night, although the temperature was 30 degrees F. Feb. 27 5 PM PST : … Continue reading →

Here are some (large) photos of the sand sizes used in filter 4. The .45 mm is the lower level of sand , and the .25 mm is the upper level.

NEW I spoke with the testing lab this afternoon regarding filter 4. The filter is working. “Working”, means that the filter is removing coliform bacteria completely from the input water; however a word of caution here: this is only for … Continue reading →

This is a quick video I made to demonstrate the operation of filter 4. Refer to the previous post of November 13 2011 “Slow sand filter construction” on this blog for more information about the parts of the filter system … Continue reading →