Filters 1, 2, 3, 4, and 5 are still operating and producing clean water. The three pond filters are also still operating. Filter 1 was started in 2007.
We are working on a pdf that has the most usefull information from all three websites and this blog summarized in one document. This will be available for download sometime in the near future (2 or 3 months).
Only two of the five gallon filters are still running. The others have been removed from use because they just do not work dependably enough. The two five gallon filters still running are set up in series. Water from the first flows directly into the second. So far, it looks like this set up may work; however the flow rate is very, very slow; not much more than 1 litre per hour.