Tetra Pond AlgoFin effectively combats the most prevalent algae types, such as blanketweed, floating and slime algae. The special active substance attacks the algae's organism and metabolism, impeding their ability to photosynthesise. This destroys the algae within two to three weeks and prevents further algae growth. Blanket weed is a consistent problem for garden ponds as it grows rapidly and entangles around equipment and plants. In severe cases it may even affect the quality of the pond environment. Algofin is highly effective liquid control for blanket weed designed to remove it and then prevent it from re-establishing itself. Uses biocides safely. Always read the label and product information before use.