Because the silver will distill out. Steam humidifiers are similar to steam distillers, except with no provision to collect the distilled steam and condense it back into water. Silver is left behind, just as are other ions and particles. This is just basic science of distilling, some volatiles will transfer in the steam, but silver is not a volatile, neither are salts. This is why scale builds up in such humidifiers--it is the stuff that is left behind that is not contained in the steam. As to keeping the water free of bacteria, silver is used for that many places world wide. Dentist offices, in the space shuttles I'm told, and so forth.
sol

At 09:18 AM 1/19/2010, you wrote:
How do you know this

In a message dated 1/13/2010 12:47:42 A.M. Central Standard Time, [email protected] writes:
  It is safe and will keep the tank water clean, but the silver does
not pass into the steam but is left behind in the tank.

sol

>
>Last night I put a simple $20 steam humidifier in his room and added
>about 8 oz of colloidal silver to the water.  He seems much better
>this morning.  I was just wondering if this is safe....to add
>colloidal silver to tap water in a steamer?



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