if you use compressed air to clean it, the way I measured my air or gas purity, at least to get an indicator without complicated things, is to attach your gas flow to a PVC tube so there is significant flow and no back-wash or diffusion, then put one of those e-bay humidity/temperature probes in there (usually meant for HVAC use), then measure the dew point, you can see what standard your air falls into based on the dew point using industrial guides.
You will probably be disappointed by most compressors, so I recommend getting a small nitrogen tank from the welding store. They are used for filling pipes or fuel tanks etc with nitrogen when you are doing brazing or soldering, so you don't get red-hot metal exposed to air making corrosion on the inside. They also sell special adapters for routing the gas into pipe networks.
The manual says 'nitrogen gas' because they KNOW facilities air is typically garbage. You can also buy clean dry air in a cylinder but the problem is, for nitrogen you can get the small sized tank, some welding suppliers will only sell you the air if you RENT a tank that is as tall as you, because no one wants to buy small tanks of air typically. But plenty of people buy small nitrogen tanks.
Small air tank is still kind of useful though if you have compressed air tools and you need to do a quick job like use a small nail gun inside of the house to fix something etc. Eventually I will buy one.
Big one is even more useful though, because you can properly run a plasma cutter on it. I ran my plasma cutter on nitrogen but without the oxygen content it does not do as good a job cutting regular steel (good for stainless or some shit tho). The little electrodes wear less when you use proper air, rather then the humid compressor shit. It's also fairly quiet compared to a compressor fucking off on you and going BRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR enough to wake the local dead.
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