Do test kits expire?

[joerdie]

Hello all, have been out of the hobby for over two tears and decided to get back in... Started taking inventory of all my stuff. I have a nice Salifert kit purchased 2 or 3 years ago. Think its still good?
While I'm at it, what about kalc mix and other powders?

 

[flower]

Yes, they expire. There should be a posted date of expiration printed on the box.
Just like medicine, chemicals only work their best for about a year.

 

[joerdie]

OK then thanks. I guess I have a lot of stuff to throw away...