The items featuring silver that I've used have silver ion coatings that kill beastie buildup in the surfaces or within the filter. Who likes black mold or other contaminants growing inside tubes and bladders? Also, I read somewhere that pond scum, even the invisible stuff, shortens the life of filters. I don't like the idea of actually ingesting colloidal silver. Small amounts in topical preparations don't much worry me, though. When feasible, I'll restrict my silver to jewelry... <w>


CM