Category Archives: slow sand water filter study and construction

On this blog, questions and comments relevant to roofwater harvesting / rainwater harvesting, biological sand water filters, and sustainable water filtration practices are encouraged. Also questions regarding the content of slowsandfilter.org, roofwaterharvesting.org, and shared-source-initiative.com/biosand_filter/biosand.html will be answered here. Comments are … Continue reading →

Thirty eight years ago we had a narrow deep hole dug in the ground to get at the water down there. When we hooked up the pump, and the water ran clear we drank from the well – we trusted … Continue reading →

This blog is associated with three other websites listed below. The focus of each site is different. Those websites and portions of this blog are all authored by the same person. The three websites/pages are: http://www.roofwaterharvesting.org http://www,slowsandfilter.org http://www.shared-source-initiative.com/biosand_filter/biosand.html These websites … Continue reading →

One of the recent comments on the last post, got me thinking: After reading this article: en.wikipedia.org/wiki/Polyvinyl_chloride and this article: www.truthorfiction.com/rumors/d/dioxins.htm and this article: www.pvc.org/FAQ/Do-products-made-of-PVC-contain-dioxins And this article about water (water dissolves more substances than any other liquid) ga.water.usgs.gov/edu/waterproperties.html and … Continue reading →

There have been some questions regarding toxins leaching from the pvc piping used in the filters described on the website referred to in this blog. Because of construction requirements we are limited as to our choices. Copper pipe has adverse … Continue reading →

Just a short note here. The “pond filter” mentioned on the slow sand filter site slowsandfilter.org has been working for 15 weeks. The thing is put together without the elaborate “baffle” pipe assembly and using .35 mm effective size sand. … Continue reading →

After reading website after website on how to build a biological slow sand filter, I have come to the conclusion that people need to learn more about how they actually work. Here are 50 references to studies on slow sand … Continue reading →

I guess this will be kind of a rant. Sorry, but it must be said, besides I have pneumonia now and have to keep from doing a lot of physical work. People are just too darn complacent. Somebody has to … Continue reading →

New information is available about rainwater harvesting from composition roofs. The slow sand filter described on slowsandfilter.org has been shown to remove petroleum hydrocarbons from water down to less than 1 part per ten million by weight; and this is … Continue reading →

A small biological sand filter (slow sand filter or Biosand filter) is maintained or cleaned by actively managing only the top 5 cm of sand. This top layer is either removed and replaced when the flow rate becomes unacceptable (typically … Continue reading →