Monthly Archives: August 2012

A SUMMARY OF THIS POST: For a slow sand filter to work we need to use “graded” sand. “Graded” sand means sand that has already been processed (sifted) so that the grains of sand it contains are mostly the same … Continue reading →

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 →

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 →

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 →