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I think Randy raised a really good point - that if a filter isn't big
enough to handle a worse case occurance, then it falls somewhere between
being window dressing and a good luck charm. You don't mention size, but
the fact that it is brass suggests it probably small, and too small to do
much - as you suspect.

I think it's time that someone told the person who started this thread that
for casual, ocassional air fills of the sort he seems to be talking about,
he doesn't really need a filter at all. One or two, or ten, or 50 fills of
diving-but-not-O2-grade air isn't going to contaminate a tank, unless it is
so filthy that some little portable filter isn't going to make much
difference.

Jeff wrote:
>The filter I have is turned out of brass, and has male and female din
>fittings.
>It has two components in it.
>When one takes into account that "clean air filters" are usually a few feet
>high.
>I have always wondered at the efficiency of the filter I described.
>Hence it's limited use.


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