Our Environmental Sampling class students setup the bucket sand filters to evaluate these simple low cost solutions for water filtration. This is a model filter that can be completely built from items supplied from a big box hardware store like Home Depot or Lowe's. A previous blog details this. http://gaiadesert.blogspot.com/2015/05/simple-sand-filter-construction.html I've made some videos detailing the setup and construction process. Video 1 Overall setup. Bottom has a perforated 1/2" pvc pipe with an elbow up to top bottom 2 inces has 3/4" gravel above that is 2 inches of 1/4" gravel 10" above that is 0.3mm sand Type of sand to use: We sourced our sand and gravel from sepulveda building materials on Waterman street in San Bernardino. The staff there are helpful in selecting the correct grain size of sand and gravel. . Videos to detail the actual experiments will come in a later vlog / blog.
