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[satch]

Hey!
I'm not shure, but I think you should buy a pump that runs without oil. Bought a used Thomas vaccum pump on ebay. It has a maximum free flow oh about 150litres, which empties the bag pretty fast, and you can reach an absolute pressure of about 0.4bar. by using a vacuumclock and a vent you can easily set the vacuum. They go for about 50 bucks.
HopeI could help.
regards,
Sebastian

[Marsh]

ok...so how do I find an oil-less pump now?

[satch]

if you you are looking on ebay it's usually written somewhere in the description.

this one here for example:
http://cgi.ebay.com/3-5cfm-THOMAS-2650-VACUUM-AIR-PUMP-27-hg-CAPACITOR_W0QQitemZ160403059286QQcmdZViewItemQQptZBI_Pumps?hash=item2558c47256
It's pretty much the same pump I'm using. works great