Pond Clean granules go to work instantly.The effects of the treatment are immediately apparent. Using the latest in oxygen technology, Pond Clean quickly restores your pond’s biological balance.Key Features : Cleans and clears pond water Works on contact Quickly cleans rocks and waterfalls Prevents unsightly water conditions Fast-acting formula is safe for fish, plants and invertebrates at the recommended dosage Size: 900 g (2LB). Heavy organic material: 3 – 16 tablespoons (45 g – 240 g) for every 1000 gallons (3785 L) of pond water. Maintenance dosage: 1 – 5 teaspoons (5 g – 25 g) per 1000 gallons (3785 L) of pond water. Spot treatment: 1 – 5 teaspoons (5 g – 25 g) per affected area. Use weekly