Sera Liquid Fert

[DR.V]

Hi all, I bought this sera liquid fert about a year or two ago. I bought about 12 bottles.

Just then I wanted to added this to my tank, and I was checking the expired date, but I cannot find them.

1. Is there no 'out of date' for such product (liguid fert) ??
2. Do you think mine is sill safe to use ?


Thanks