I keep a tube in the medicine cabinet. I might not use it for a year, but it never goes bad, and I can't tell you how old the tube is.....

Put some on, cover with a band-aid. In a day or so the infection is usually gone.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).