this happens. Before filtering (because thats your product youd be filtering out) stick a pin in the stopper without a syringe on it. That is your air vent. You can either heat over a shallow pan of boiling water (use tongs to hold the vial bc itll get hot and youll drop it) OR you can stick the vial in the microwave for 10 seconds at a time. For some reason the small amount of metal in there wont spark so dont worry. Every ten seconds take it out and shake the shit out of it. Let it get REALLY warm but not so hot you cant touch it with your hands. Keep doing this until the crystals dissolve. If this is done properly and there are no crystals you wont have to filter. Again, i dont recommend filtering bc youll lose product.

If you are still going to do it anyway, buy a sterile, sealed vial from one of the accessory shops on here and a syringe filter (22micron) and a 10ml syringe. Heat the vial of oil like i told you, shake it until no or few crystals, cool the oil until its just warm, draw the whole 10mls in to the syringe through the filter, pull the filter off, put on a new pin (large gauge works best like 22 or lower) and inject the whole ten mls into the new sealed sterile vial. Label it.