High Performance! With the power of potassium permanganate, Pond Fizz Tabs Oxy Clear tablets clear cloudy water of organics and are effective against many external fish infections caused by fungi, bacteria and parasites to include protozoans and flukes. Oxidizing Power of Potassium Permanganate Treats a Broad Range of Fish Parasites Clears Cloudy Water of Organics One Tablet for Every 50 Gallons Contains 20 Tablets In Stock-Ships Fast