JBL Biotopol quickly converts tap water to healthy aquarium water. Toxic heavy metals like copper, lead, zink etc. are permanently neutralised. Harmful chlorine and chloramine are quickly and efficiently removed from the water. JBL Biotopol protects gills, skin and fins with special organic protective colloids and aloe vera. A concentrated vitamin B complex protects fish skin against stress and reduces the risk of disease. JBL Biotopol adds essential ingredients (plant matter, colloids etc.) to the tap water so that the fish find the same substances they know and need from their natural habitat.Dosage: 10 ml for 40 l of aquarium water. Over-dosing is not harmful. 100 ml are sufficient for 400 l water.