An update regarding our ongoing work on slow sand filters. All of the filters here are still working. The oldest, filter 1, is working after 8 continuous years running. Filters 2, 3, 4, and 5 are still working.
Here in Washington state, it has been a hot dry summer, and the fall is starting out dry also. If we get a repeat of last winter’s lack of snowfall retention in the Cascade mountains, there will be major concerns regarding water here in western Washington state.
On another similar topic; the Earth’s ground water is being used up faster than it is being replaced. In areas where there are large aquifers that are used to supply water, this is a huge problem.
It might be a good idea for people to learn about biological sand filtration and rain water harvesting sooner, rather than later. Think about water. There’s lots of info in this blog about slow sand filtration and rain water harvesting.