The UltraClear Winter Blend is specifically formulated for fall-winter-spring treatment of your pond. Its probiotic formulation of select beneficial bacteria ensures your pond has the required bacteria to maintain a clean pond & healthy fish during the colder months. Start using when water temperature falls below 55°F. Use in ponds with water temperature down to 35°F Reduces ionized and un-ionized ammonia Reduces build-up of material from decayed aquatic vegetation, leaves, grass, excess food & fish waste Provides ongoing biological activity as water cools down Will sustain surface freezing Safe for fish, all aquatic life, wildlife & pets Reduces spring clean-up and boosts fall prep DOSAGE: Use 1oz per 1000 gallons weekly beginning when water temperature drops below 55°F. Double dosage if pond has an excess accumulation of organic debris. Safety Data Sheet