Phos negator is an all-natural, mineral-based solution that is highly effective at preventing green organic growth in pond Waters. Phos negator works throughout the water column by binding to the phosphates & causing them to sink to the bottom of the pond. Making this product safe for the environment & the water overall cleaner. The organic matter found at the bottom of a pond When decaying generates phosphates & nitrates which are contributors to green organic matter. Phos negator will bind up the phosphates causing them to sink to the bottom of the pond rendering the phosphorous ineffective. Nirates & other organic nutrients will still exist. To maintain water clarity, follow up with Healthy Ponds all-natural products. The beneficial bacteria in the Healthy Ponds products will consume accumulated dead organic matter. Use phos negator in early spring before growth of green organic matter begins &/or as needed to reduce phosphate levels. Can also be used when there is existing green organic matter on the pond. Use in the S month of treatment in conjunction with Healthy Ponds all-natural products. Phos negator is an all-natural product safe for fish, animals, plants, pets & humans.