Do nutes have an expiration date?

I've got some FF nutes that have been sitting around for a couple years in a climate controlled area, is there a "best used by" date on nutes at all?

Liquid probably - salt ones (if they aren't exposed to moisture) probably not

seems like my old ones develop stones of sorts. This happens when two parts are mixed too. I suspect if
nutrients are forming rock balls in the jug there may be some question about what is actually available to mix up next time

besides, FF , well, you know.......

It's just chemically impossible to mix nutrients in liquid form and have a high concentration and be stable...

smell them, they usually will smell bad if they have gone bad.

Dr.Nick Riviera said:

smell them, they usually will smell bad if they have gone bad.

Click to expand...

noticed this with organics but not salts. I've got some bottled sensi from 2006 and it smells like nothing today so far.