Microbe-Lift PL contains photosynthetic bacteria. (Vegetative Cultures) Creates a cleaner environment for your pond. Improves fish health growth and longevity. Promotes cycling of pond including nitrite elimination. Reduces cloudy water. Dissolves away organic sludge. Seeds and maintains biological filter. Safe for wildlife and pets that may drink out of the pond. 1 gallon treats a 5000 gallon pond for 21 months. Microbe-LIft PL speeds the removal of all organic waste matter in ponds by adding a select group of microbes that increase the rate of organic breakdwon and improve filter performance.