Hi Andy

This sounds like the infamous "Run your engine for 2 months on one teaspoon
of Sodium Bicarbonate" that is doing the rounds at the moment.

Their theory goes that you have two non ferrous springs, one inside the
other, with terminals. You put them into a close fitting jar and fill with
weak Sodium Bicarb solution. Add some volts and hey presto, instant hydrogen
for ever.

or is that Cold Fusion? ;-/

Interesting, but I'd not heard this story. It's actually just that I'm
making something christmassy and a bit silly.

Cheers
Jon N