A CAWST training manual covering Bio-Sand water filtration.  This manual is presented in complete and un-altered form.  This is vital information in developing countries because water borne diseases and parasites are major problems in areas where there are few wells and no water treatment plants or facilities.  

These filters are relatively simple to build and easy to maintain and operate.  The Biologic zone in the filter kills off the bad bugs and the sand filters out the contaminates.  You get good clean and clear drinking water from the turbid or contaminated water you pour into the filter. 

 Designed to bring healthy water supplies to third world countries where plumbing is non-existent.  The filter housing can be made of concrete and nearly all materials can be made or rounded up locally, although, some materials should be used such as screens and hoses.  There is also information on how to use sunlight to sterilize water and there are charts and graphs which show how the filter works and what capacities can be expected from the filter.

Preppers and survivalists will also appreciate this information, this is cutting edge info in its purest form! This listing is for a paper copy of the book.