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Syringe Filters are luer lock or luer slip compatible filters that connect directly to a syringe. They are available in a multitude of pore sizes, for our purposes we need .2 or .22 micron. Anything larger and microorganisms will be able to pass, and sterility will not be achieved. You would draw directly from your brew, connect the filter and a 20-23g needle to your syringe, and inject into a sterile vial (one you have sterilized, or have bought pre-sterilized). If you use larger than a 20g needle, you risk cleaving the stopper into the vial and you'll have pieces of your stopper floating around in your vial.