Tetra AlgoStop depot combats all types of algae effectively and prevents new growth.\n\n- Combats and prevents green, brown and red algae\n- The long-lasting, high-dose agent is released slowly and evenly\n- After 4 weeks the ingredient is fully released\n- Replace the tablets every 4 weeks for lasting prevention\n- The tablets do not dissolve but keep their shape\n- For all freshwater aquariums