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Does anyone obey a "use before" date on a container of table salt? I doubt there even is a "use before" date on them. Our basic NPK fertilizers are just salts, so they can be treated just as we treat table salt. Trace element mixes are different because they are almost always chelated mixes, and the chelator is an organic chemical, not a salt.
 

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The rust just adds a bit more iron to the mix. Seriously, it doesn't seem like a good idea to store fertilizers in metal containers, or even containers with metal caps. I keep mine in polyethylene "tubs" made for storing left over food. I do wonder if my almost 4 year old CSM+B is still as "powerful" as it was? Does anyone know? I'm too cheap to buy more if I don't have to.
 
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