DNA ecological super algaecide blocks DNA replication by reacting with algae's chlorophyll, protein and enzymes, causing abnormal metabolism of algae cells, and stopping algae and algae spore cell reproduction within 72 hours. Goodbye Algae is a formula from the latest scientific research results of the Chinese Academy of Life Sciences: new technology for environmentally friendly algae removal, targeted algae removal without any side effects, no residues, and no harm. For all Fresh & Marine aquarium Net weight : 280ml Usage & Dosage: 1. Apply 25ml/100L, after 2days,apply again25ml/100L.72hours/one treatment. 2. In general, add 15ml of this product per 100L water to prevent growth of moss two week.