For quick results on eliminating floating organic matter on the surface of a pond, Rush is the product for you. When Rush is applied to the floating matter, it is oxidized causing the organic mat to sink to the sludge layer where the AquaSpherePRO, used in conjunction with Rush, will consume the excess nutrients preventing reoccurring issues. Rush may need to be applied at various times throughout the season depending upon the ponds natural condition. Rush should be applied directly to the surface of the floating organic mat in ponds. Dosage will depend on amount of matter, the larger the mass the heavier the dose will be. Rush is safe for fish, pets, wildlife and plants.