I run into a lot of mixed refrigerants. I have a Nuetronics analyzer to check every recovery tank before I pump it into shipping tanks. If you don't have a good analyzer, your best bet is to recover anything that has been tapped into a junk gas tank. I'm starting to run into more residential condensing units that were converted to 407C. With R12 at 20.00 a pound and R22 at 7.00 a pound any screw up can cost you a bunch of money.
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