Potassium permanganate (KMnO4)
Common treatment rates are 2 parts per million (ppm) or milligrams per liter (mg/L) for an indefinite pond application or 10 mg/L for a 10-minute tank treatment. Actual treatment rates in ponds will vary depending on the amount of organic matter, or organic load, in the water.
Administer as a static bath to control external protozoan and metazoan parasites, and bacterial and fungal infections in a variety of warmwater fish species. Use at a dosage of 1-10 mg/L for 1 hour. Although a single treatment event is generally efficacious, repeated treatments may be used.
Withdrawal period: none for fish that are not susceptible to legal harvest for a period of 7 days post treatment associated with use of Potassium Permanganate.
Overestimating water volume can result in a greater-than-desired concentration of chemical, and may injure or even kill fish (reference: indianasoybean.com).