Water quality tests on filter 4

slow sand filter

These are the most recent tests done on filter 4. The filter was frozen solid through the month of January, 2013.

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 is a 200 square foot surface that does not get much precipitation falling on it because it is under a dense cover of forest.

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