Ornamental ponds and pools are on every gardener's wish list. But water clarity is one of the biggest concerns of those with water gardens. The special microbial blend contains a trillion microbes per pound to help fight the problems commonly associated with water gardens. Improves water clarity. Reduces unpleasant odors. Will not harm fish, aquatic plants, animals, beneficial aquatic organisms and waterfowl. For best results, make your own biosock with an old nylon stocking, put Pond Clarifier inside the stocking and place it in the pond. Leave the stocking in the pond for 24 hours. This will allow the time-released properties of Pond Clarifier to work best. Pond Clarifier does not decompose leaf litter.