bela Posted June 15 Share Posted June 15 I have got a bottle that I was thinking about using, but who knows for how long it has been opened and I do not want to kill anything in the tank. Can I? Thanks Link to comment Share on other sites More sharing options...
Guppysnail Posted June 15 Share Posted June 15 If you go to their website they have a tech support phone number and I believe a message support feature. They are very helpful in answering questions. 2 Link to comment Share on other sites More sharing options...
nabokovfan87 Posted June 15 Share Posted June 15 Mine is pretty old. I still use it. I'm talking close to 8 or so years old? I can try to find a date on the bottle. I would say is loses some effectiveness because that just what chemicals do that are stored in plastic bottles over time, but it shouldn't cause any issues and should work for the most part. 1 Link to comment Share on other sites More sharing options...
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