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Category Archives: slow sand water filter study and construction
Slow sand filter field test (filter 5)
Filter 5, the most recent filter set up here in May of this year is now working. The drainpipes inside the filter at the bottom of the barrel are covered by 4 inches of pea gravel. The sand directly on … Continue reading
slow sand filter construction techniques
This is yet another update on what has been learned regarding the construction and operation of a small slow sand water filter. These are issues that stand out after experience building, testing, and operating small slow sand filters over the … Continue reading
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Testing the water from a slow sand filter
Some of the water quality tests done here on filter 4 and 5 are done. These tests were done with the testing kits available from Micrology Labs. The interpretation of the results of our tests are posted here along with … Continue reading
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Roof water filtration system
More notes on roof water quality required for a slow sand filter: Experience here in the art of roof water harvesting and slow sand water filter construction is a continual learning experience. The newest roof water filter here (filter 5 … Continue reading
Finding sand and mesh size for a slow sand filter
This is an update of the previous post on slow sand filter sand sources. Instead of trying to find specialized sand sizes from a manufacturer, it can be more convenient to sift easily available sand to get the right grain … Continue reading
Slow sand water filter sand source
A SUMMARY OF THIS POST: For a slow sand filter to work we need to use “uniformly graded” sand. “Uniformly Graded” sand means sand that has already been processed (sifted) so that the grains of sand it contains are mostly … Continue reading
water filter sand
This is an update on the post about sifting sand for a slow sand water filter. I wrote about this in response to a question from a reader. I recommended using stainless steel wire cloth to sift “play sand” so … Continue reading
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How does a slow sand water filter work?
A slow sand water filter (sometimes called a biological sand water filter) works like this: Because of the pull of gravity, water flows down through a sand bed in a container about 3 feet deep from the top to the … Continue reading
Slow sand water filter DIY video
The new video for filter 4 is up on YouTube as of today Aug. 3, 2012. Below is a parts list: (this may have some errors and omissions – occasionally, I do this documentation in a hurry in my spare time … Continue reading
Can I use beach sand in my slow sand water filter?
The answer to this question is no; with maybe a couple of exceptions; but these exceptions are rare cases that probably don’t apply to most situations. If the “beach” in question is a river bed where fresh, non polluted water … Continue reading