Monthly Archives: October 2013

Water filter test summary

After 4 years of college where I learned (hopefully) how to write about what I observe; and following that, close to 7 years of designing, building, studying, and operating small scale slow sand water filters (often called biological sand water … Continue reading

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Uniformity coefficient of sand

To determine the uniformity coeffient of sand (from a chosen source):   First: Take a small sample of the sand and determine the sand grain size (wire mesh hole size opening) at which 60% of this small sample‘s weight passes … Continue reading

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Slow sand water filter operation and water clarity

A┬árudimentary test was done yesterday, October 2, 2013, ┬áto evaluate water clarity on all of the filters running here. The filters that have the least restricted output flow also have the clearest water output. Two of the filters that have … Continue reading

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Roofing material and rain water harvesting

We have had water collected from a composition roof at this location tested by an EPA certified laboratory. The water passed (actually far surpassed) all epa, and local requirements for potable water purity after being run through a small slow … Continue reading

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