AQUAPLANCTON - Safe for Fish and Pets All Natural Pond Algae Treatment Avoid Harsh Chemicals Safely, eliminates green water, string and other forms of algae. Brings about a balanced eco-system. This all natural product can take 2-3 weeks to work and in a few cases longer. Unlike harsh chemical killers that wipe out algae and all the friendly bacteria in a pond AQUAPLANCTON works with nature to gradually build up friendly bacteria to overcome algae and prevent it recurring. The few bad review we have come from people expecting instant results so we urge patience. Harmless natural mineral safe for fish, plants, pets and all forms of water life. Works with all types of liners, Ultra Violet and biological filters. AQUAPLANCTON helps clean your pond eating through organic material at the bottom and turning this into friendly bacteria. Works best when there is some sediment/muck at the bottom of your pond. We suggest that in most cases ponds are not cleaned out unless they are truly disgusting but even then try and remove the worst of any build-up of muck but try and leave the pond water and some material behind otherwise you will destroy the delicate pond eco-system and likely continue to have poor qualit Dose is based on the surface area of your pond at the rate of one pound for every ten square feet of water you have. Depth and gallons are not important. A pond 8 by10 feet is 80 square feet needing 8 pounds. A pond 20 by 10 needs 20 pounds etc. Please buy enough for a second treatment 1/4 of the first as this may be needed 4-6 weeks later. That should be all you need a year. After your purchase our help line will respond quickly to all your questions as we want you to have a great result. If you have any question at all call us as in most cases we will identify the cause of your algae problems.