For the last several years Potters for Peace has achieved remarkable success in helping to popularize a seven liter, 'filter bucket,' resembling a flower pot, which nests in a lower container.  This filter is similar to the pottery media disks and candles in that it is also made of red firing clays and is saturated with the colloidal silver disinfectant.

Madyapur Clay Crafts, the proprietor Hari Govinda Prajapati.  For his production of the pottery purifiers in Nepal, as well as a number of other types of candle systems, Hari is deserving of great thanks and praise.

PFP has been involved with numerous micro biological tests in the countries in which they have helped begin projects:  Nicaragua, Honduras, Haiti, Cuba among others.  The overwhelming results of the tests has been excellant pathogen removal, and this evidence has been instrumental in a rethink by water and health policy makers, that colloidal silver is indeed effective.

Cranfield University (U.K.), Institute of Water and the Environment
http://www.silsoe.cranfield.ac.uk/iwe/cws/

10 Oct. '03-  Initial research on pottery purification media is near completion at the Institute of Water and the Environment of Cranfield University, under the subject, Community Water Supply.  This has included replication of the production of pottery water purifiers.  And purifiers have been tested and assessed for the removal performance of protozoan, bacteria and viruses.  Following is the Email address of the researcher, Stuart Cheesman: <scheesman@hotmail.com> The great help given by Stuart Cheesman is highly appreciated, with his observations as to improving the information available on this web site.  Several of Stuart's invaluable suggestions pertain to aspects of clarifying the forming process of purifiers.  And he also expressed concerns on sourcing the silver.  It is to be hoped that the observations, and the changes made on this site will encourage others to begin making the purifiers available.

Mike Mares and John Heasley, Jr.
The Automatic Polarity Reverser was designed, and the parts donated, by Mike Mares who works for Metro Environmental, Inc. in Clinton Township, Michigan, USA.  John Heasley Jr. a journeyman electrician who works for Gillis Electrical in Livonia Michigan expertly assembled the unit. John Heasley Jr. worked several hours assembling the unit the night before his dad and mother were to deliver it to Nepal. Both Mike and John Jr are extremely competent electrical technicians who did an exceptional job on producing this device. Thanks to both for volunteering their time, money, and expertise to assist in the development of low cost water filtration systems for the people of Nepal.

From the standpoint of the project this electrical device has been a real boon.  The first device used was in manual switching, every one minute.  So, five to six hours of switching could be an exhausting experience. 
A more recent device did not have uniform time periods for the two poles, so the stability of the reaction was lost, the silver precipitating as oxide.  So for time periods utilizing the automatic reverser the system has remained stable for upto thirteen hours.  With an inexpensive source of water this time period could be all that is needed for an economically viable system of CS generation.  Thanks go to Mike and John.