Sera Omnipur S combats the most common ornamental fish ailments in freshwater aquariums Bacterial infection Fin rot Fungal infections (Saprolegnia Achlya) Skin infections (Costia Chilodonella) Trichodina Oodinium Gill & skin worms (Dactylogyrus or Gyrodactylus) External wounds or lesions 50 ml is good for 1000 Liters of Aquarium Water User instructions Shake well prior to use. Drop 22 drops or 1 ml into 20 l of aquarium water. If you do not notice any visible improvement after 7 days repeat the process after a 24-hour filtration over active coal. During the treatment switch off the UV lamps & do not use an active coal filter for good air circulation. Once the treatment is complete we recommend changing the water. Attention Keep this product out of reach from children & animals! Read package instructions!