• Easy to use • Kills both internal and external bacteria • Safe and effective • Will not cloud water OF Unique “Yellow Powder” is the result of our long term commitment in R & D and the only Yellow Powder around that has a specialised formulation against both internal and external bacteria. Our Yellow Powder is not only very effective against skin lesions, it is even more effective against intestinal bacteria infection. Our OF Yellow Powder is effective against fin rot, gill rot, hemorrhagic septicemia, mild dropsy, skin lesions, bacterial infection of the digestive system and many other bacterial infections.