EHEIM Watercare Algozid is a water care product which mainly consist of microbiological substances, such as occur in nature. It has gentle but effective effect on the environment, without unbalancing the ecological balance .
The Algozid is a biocide for algae control. It helps in the battle with the algae by preventing the algae from forming and fight with the already formed one.
Please remember to read the instruction carefully and never put in the water of your aquarium more then the described.