Ultra Clear Potassium Permanganate Solution. This age old remedy has been used for decades and well known by fish keepers to be one of the best. This solution of Potassium Permanganate is effective against external fish infections from fungi, bacteria, and parasites (Trichodinia, Costia, Chilodonella and flukes). It is also an effective solution for improving water quality and clarity by clearing cloudy water of organics. It is a strong oxidizer that, once added, makes a light pink color that will dissipate. One bottle (16 oz) treats a 6000 gallon pond, formulated for 2 ppm doses. Use half strength for routine maintenance. For parasite and bacteria dose (4 ppm). Repeat every 3-4 days if needed for parasites.