I have been searching the forum this info for awhlie. Used the search feature with no luck. I know I have seen some opinions somewhere. I have some unopened/unused FF thats about 4 years old. Its been stored in a cool dark place for the entire time. Why would they go bad? Also why would GH 3 part flora series go bad if they send it into space? Do I really have to toss the older nutes out and fork over more money? Any input would be appreciated.