Why would these have anything to do with homebrewing, you ask? Great question. These are an easy way to measure 6 mL of Star San. Put 6 mL of Star San in 1 gallon of distilled water and you’ve got sanitizing solution. Fill up a spray bottle and you’re ready to sanitize for pennies a batch. See: Star San Tips, Tricks and Guidelines
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Make sure the components you use are compatible and rated for your intended application. Contact manufacturer with questions about suitability or a specific application. Always read and follow manufacturer directions.