slow sand filter update

The oldest filter here was started in 2007. Its still running. The sand has not been changed since it was started, and it has not been wet harrowed for 9 years. The output water needs to be tested, but the water is clear and looks clean. Still it must be tested. The other filters here are still running and in service. The three pond filters, and four other roof water filters are still running, and producing clear water. All need to be tested again. None have had the sand changed. Three of them have been wet harrowed twice in 5 years, but the sand has not been changed. As I get more time there will be updates. Other concerns have temporarily altered my focus. Now, I hope to get back to more filter work.

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