Shelf life is 3 years.
Do not smell it as it is an inhalation hazard.
Search for Glutaraldehyde or Pentanedial (C5H8O2 ):
Product names: Cidex Metricide Omnicide 14-Day not the 28-day. $21 gallon on feebayshipped.
Fixed my BBA issue while I stabilized the tank (Temps, Par, CO2, pH, KH, organics). I did not do the initial nuking the tank per the Excel directions, just hosed the BBA in select areas every morning or two with a long dropper. No more than 15ml in my 12 long. Took a couple days to make the BBA red then it turned white or dislodged itself. Ready for picking with tweezers. Done dosing after 2 weeks. Plants, snails, shrimp, fish never effected. Shrimp and snails grazed on it once it turned colors.
It will begin to deactivate once diluted with water.