You have sulphur in the air and silver will tarnish over a long period of time, but there's no reason it would get into your CS water fast enough to make any difference.

 Wrap the silverware in Aluminum foil and salt water for a few minutes.
Rinse and dry, then store it in an air tight container.
Sulphur in tap water isn't uncommon...might want to final rinse with distilled.

ode

At 01:06 AM 5/10/2012 +1000, you wrote:
All my silverware tarnishes - how can I stop this happening?

Thanks!

Jane
From: <mailto:odecoy...@windstream.net>Ode Coyote

There is no freekin way that silver is going to "tarnish" without any source of Sulphur present.