Stephani Stephenson on wed 16 sep 09
I know reaid HArvey and others have been working with ceramic water filte=
=3D
rs for years.
Tracy Hawkins is putting the idea to good use. interesting clip.
I wonder how the silver layer is put in.
http://www.cnn.com/video/#/video/world/2009/08/19/iyw.safe.water.cnn
Stephani
ivor & olive lewis on thu 17 sep 09
The bisque fired filter element is soaked in a solution of Silver nitrate
and then refired at a relatively low temperature.
Silver nitrate decomposes before the temperature reaches 500 deg C leaving
behind a micronised deposit of metallic Silver throughout the clay fabric.
Silver and its compounds have bactericidal properties.
Best regards,
Ivor Lewis,
Redhill,
South Australia
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