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.