Little Giant 566039 Microbe-Lift Autumn Winter Prep, 20 OzHighlights: Autumn winter Seasonal water treatment Helps accelerate decomposition of leaves and other organic matter for healthier start in the spring Continues to provide sustained biological activity, even when the water temperature are under 40 degrees F (4 degrees C) Contains Psychrophilic strains (cold water bacteria) Helps fish maintain healthy immune systems during winter months Also use to jump start your pond to a healthier environment in the