I had an Ultrasonic unit first but went to compressor unit.
To me it works better. My Ultrasonic said it would not be good for some
meds.
They were to thick or some thing, not sure why.
Bob

First of two posts I found in my files - hope they help:

          Hi Lin:
        
          Humidifiers work, but again, they are the lowest quality.
People think that a big, thick mist that nearly chokes you when you
breathe it in indicates a high quality and a high level of
effectiveness...  In truth, the exact opposite is true.
        
          As an example, the "Brooks Bradley" oxygen nebulizer, when
used most effectively, has a mist so fine that you cannot even see it
without using a mirror ( using the CS nebulizer to fog the mirror ).
        
          The highest quality ultrasonic nebulizers create a very fine
mist that actually has quite a dry feeling when used.  The fine mist
medical nebulizers create "vaporized particles" that more easily
penetrate deeply.
        
          Furthermore, Stephen Quinto, years and years and years ago,
studied the effective difference between different types of atomizing
technologies on colloidal silver.  All of the mechanical technologies,
including pressure-fed, adversely effected the quality of the colloidal
silver used ( in other words, every other type of nebulizing technology
other than ultrasonic ).  How much the change interfered with the actual
effectiveness of the silver in-body, of course, could not be
determined... if it does at all.  
        Never-the-less, I don't want such simple truths to be lost.
        
          Humidifiers, even ultrasonic ones, are designed with
dispersion in mind, not vapor atomization ie. vapor particle sizing.
For pets, due to logistics, it MIGHT be a better choice to use one, as
it can be troublesome to get a pet to sit still and breathe in the fine
mist from a nebulizer... but for people, the high quality technologies
are vastly superior.  I've tested medical oxygen nebulizers, the "Brooks
Bradley" oxygen nebulizer ( my personal favorite ), pneumatic
nebulizers, ultrasonic nebulisers, and 
        humidifiers.
        
          I usually use a Omron ultrasonic nebulizer, as it is the most
convenient and quite effective.  Nebulizing EIS, this flu season and
last, seems to be far more effective than oral use alone.  The flu
strains running around the cities this year are particularly brutal.  
        
          Yes, there is alot of different information out there, which
can be very frustrating, considering that we're dealing with a science
here and not an art.
        
          I don't know about 24 hours a day...  Five minutes every hour
or so would be wonderful, but you'd have to get the cats to directly
inhale the CS from a nebulizer or humidifier.  If you are considering
using a humidifier to lob mist into the "general vacinity" of the
animals, then I'm not sure how to advise... as you can't really be sure
that the cats are actually breathing in any silver.  You'd have to
experiment and actually examine the environment to see if you can tell
if you are successfully reaching the 
        cats.
        
          Best Regards,
        
          Jason
        
          


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