[APML] Dry Nitrogen & Pre purified Grade 5 same ??

["Gerry Cichocki" <gcichocki@hotmail.com>]

Good Morning group, trying to put together a nitrogen purge system on a 
Nikon F3. Got a lot of info  on here over a year ago & finally got the 
regulator &  low-flow meter.
I called the gas supply store & they say "dry nitrogen" is "old school" & 
what they carry is Grade 5 pre-purified (grade 5.5 & 6 is the highest). This 
is supposed to be much better  because the dry nitrogen was pumped in a way 
that it was possible to get some oil in the tank. The pre-purified 
eliminates that.
So can I use this pre-purified grade 5 stuff ? Any info on this subject is 
appreciated. Gerry

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