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Having a sailboat I do not use a lot of fuel. I have been using the same container of Killem biocide for the three seasons I have sailed the boat. It has developed a yellow particulate that does not redissolve. It actually seemed to do that within the first year. Anyone have experience with shelf life of Killem or Biobor & how long it is safe to use?
Once opened and exposed to air, the shelf life of Killem is about one year. The active ingredient in this biocide is "Sodium-dithiocarbamate" which is a salt and will tend to crystalize, over a period of time, once exposed to airborne contaminants. The shelf life could last longer if kept tightly sealed and in a cool, dry environment. The product still can be used past one year, albeit it will not be as effective as fresh product.
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