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KS,
I use 2ppm and sometimes stronger. I would suggest you go to Erik Johnsons D.V.M. koi health and disease book. The AKCA book store has it and it is one of the most helpfull books around. What I do In my pond comes from years of trail and error so many factors come into play. I will tell you this if you know your ponds gal 2ppm will only help and will do no harm. Its best to read up on this so you feel at ease when you first try it.
Louie
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