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pennies in hydroponics

Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html

Ward Griffiths wrote about adding pennies to a hydroponic solution:

>I just checked my pockets, the only pennies there were made of
>zinc with barely enough copper to give them color.  I guess clad
>dimes and quarters will do it, they still have fair copper content
>even if it only shows at the edges.
>--
>Ward Griffiths    wdg3rd@home.com    http://members.home.net/wdg3rd/
>
The copper clad pennies would work better than the dimes and quarters 
because it isn't the thickness of the copper that is important, it is the  
surface area. The larger surface of the clad pennies would allow the copper 
to oxidize and enter the water in ionic form.

Matt SParks
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