I leave mine in the plastic bags they came in (ziplock) and in the box they shipped in, I make a 250 ml old soda bottle of wet solution (1 micro, 1 macro) that lasts me from 3 to 5 weeks then I pull out the box and make more solution. I'm always adjusting how much of each I use to get the tank dialed in so I like doing it this way but you could use anything to store your dry ferts in as long as it's kept dry or air tight and out of any sunlight. I suggest the same way you handle your tablesalt, in a cabinet or drawer.
I remember someone here using stick on labels that fell off, so use a sharpie or something permanent to mark the container.
They don't go bad, but many are hygroscopic and will absorb moisture. This is why they cake up. It would make them less concentrated by some amount, but not enough to really make any difference when measuring out doses.
A side note, this is something i like to do that may be helpful for daily use. I have a 7 day medication container. On sunday, my EI water change day i refill the container with macroos and micros plus my GH booster. Couldnt be easier for dosing. Open and pour. Days are labeled if ur like me at 6 am and cant think straight
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