Outdoor Water Solutions PSP0125 Lake and Pond Dye, Blue Liquid pond dye 32 fl.-ounce 4 times concentrated, this product is equivalent to other companies one-gallon containers All-natural, product is safe for recreational ponds, horses, cattle, birds, fish wildlife and the environment. PSP0125 Liquid pond dye 32 fl.-ounce 4 times concentrated, this product is equivalent to other companies one-gallon containers All-natural, product is safe for recreational ponds, horses, cattle, birds, fish wildlife and the environment.