How To Use Progressive Web App aka PWA On 420 Magazine Forum
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Liquid or solid? Solid---how long will salt last? Most liquids are basically chemical solutions, and have a long shelf life if not contaminated with some life form. Stuff will grow in the liquids if you let it in. I pour from large bottles into empty Gatoraide bottles, and measure with a syringe from there. That way I don't contaminate a large amount, because I don't rinse out the syringe between nutes. Assume any mixed/diluted nute solution will spoil over time unless you sterilize everything and operate in a clean room. Refrigeration will prolong liquid mix shelf life. Heck. you could probably freeze it.