>> couldn't you use water crystals to reduce moisture in your seed storage containers?
I don't know, I never researched those. They would have the advantage of having a HUGE capacity. But are they "strong" enough to pull humidity out of the air even at 20% RH? I'll try to research that, and also how to regenerate them (maybe just air-dry them? )
It would be good to have a cheap desiccant that would never over-dry seeds (below 10% RH) no matter how much you used.
Do you happen to know the chemical name of those "water crystals"?
