(Sodium Aluminosilicate is FDA Approved) 4A has a larger pore diameter than 3A. It's used for static dehydration in closed liquid or gas systems and is commonly considered a universal industrial strength desiccant.
I**E
Does the job for water adsorption, would recommend activating before use
Ran a quick test: poured tap water over a quarter cup of sieve. It quickly evolved heat and even a little steam. Probably not lab grade, but it'll function quite nicely as a desiccant. Activating before use is still recommended. Out of the package, some ,modest amount of moisture was released into a closed vessel upon heating.
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