The problem is atmospheric water getting in and wetting the salts so that they go lumpy and someties change colour, especially if sunligh gets to it. I have a large bag of fertiliser that I keep sealed. When all my containers are empty, I wash and dry them, then go to the big bag and fill the two large containers before resealing the bag.
Then those two containers are used to to up the day to day jar with about 50g. By the time I am getting to the end of the day to day jar, the fertiliser is getting lumpy and damp, and I wash it out whe it is empty, and when it is dry, I top it up with another 50g etc etc etc.
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