Tetra Algofin blanketweed solution. HSE approved algaecide for blanketweed. AlgoFin is a highly effective, liquid control for blanketweed designed to remove it and then prevent it from returning. Mode of action: specifically engages in the organism and metabolism of the algae and thus inhibits their ability to carry out photosynthesis. Contains 2.2 inches, 2 inches (hexahydro-1,3,5-triazine-1,3,5-tryl)triethanol. May cause allergic reactions. Prevents further algae growth. Safe effect For use in: ornamental ponds with fish, plants and micro-organisms. The special highly effective active ingredient unfolds its effect over a period of approx. 2-3 weeks.