http://www.enlight-inc.com/blog slow sand water filter study and construction Sun, 28 Mar 2010 19:21:40 +0000 http://backend.userland.com/rss092 en 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 filters, roof water harvesting and related information Read them. Most of ... http://www.enlight-inc.com/blog/?p=26 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 fire people up. So here goes . . . . ... http://www.enlight-inc.com/blog/?p=24 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 when it is operating at its LEAST efficient rate of ... http://www.enlight-inc.com/blog/?p=14 A 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 4 to 6 months) with clean sand or "wet harrowed" meaning ... http://www.enlight-inc.com/blog/?p=7 First; my humble apologies for being so slow to moderate comments. Vast improvement is in order. We have updated the software that runs the blog ( as of July 24 2009) which went perfectly. Moderating should be quicker now. The slow sand filter works using biological processes. Water passes through a ... http://www.enlight-inc.com/blog/?p=3