Old Alkalinity and Kalwasser mix

[DharkaronReef]

Hello, I have 3 old Alkalinity and Kalwasser mix which I can't find the expiration date. I believe it's from 2012. Is it safe to use? Or should I trash it and not risk it?

 

[Gareth elliott]

These should be pretty shelf stable, only concern i would have if they were no longer powder but turned solid from high amounts of moisture getting in.

 

[DharkaronReef]

Only the reef builder carbonate alkalinity has solid buildup. The other 2 are still soft and powderish.

 

[Gareth elliott]

I wouldnt use the alkalinity one will be hard to measure accurately in chunks.