One pack treats up to 1.5 acre foot of water Aquascape Lake Blue Dye Packs safely dye water an attractive blue color to shade and protect lakes and large ponds. The easy-to-use water-soluble packs dose the water column evenly and make it easy to treat hard-to-reach areas. Aquascape Lake Blue Dye Packs significantly reduce maintenance while preventing and eliminating water quality issues. The treatment will effectively filter sunlight, cool water temperature, and help hide fish from predators. This treatment is for lake and large pond use only and may cause issues in smaller enclosed systems. Safe for fish, plants, and animals when used as directed.