Slow sand water filter failure: update on filter 5

After the failure of filter 5 in late May of this year, we changed the top 6 inches of sand from .15 mm effective size, to .25 mm effective size sand. We are now using a re-circulation system on this filter.

So far, there has been a gradual improvement in the clarity of the water. The foul odor has also gone.

More later. . .   .

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