Err slightly off on a tangent here but at work I use fabrics to make blinds which are impregnated with silver, the silver has an effect on bacteria such as MRSA etc so it could be working along the same lines?maybe!
Is there a tank size restriction on the size of the unit, or is it one size fits all? be good to see how it goes Flapping. I will keep an eye on your results. If it works I will put one in my 6foot planted tank.
Is this the same silver that also keeps Werewolves at bay and all that, and that's a myth as well, oh cynical me.