So I recently bought some new inserts for my diapers. They definitely work much better, but I still have all the old inserts (almost 2 years old now). My question is, how do I know for sure when to give up on the old inserts (I didn't buy a whole new stash yet, just a few to see if that helped). Is there a way to test the absorbancy so I know for sure if only certain ones are needing replacement while some still work?

Once I know if they are truly done - what should I do with the old inserts? Anyone have a way to re-purpose these? (My old inserts are mostly BG 4.0 one sized microfiber inserts so they have snaps on them). Thanks in advance for your help.