Midnight Blue Pond Dye Dissolvable Packets are formulated to provide ponds with beautiful reflections. For year-long beauty, apply in early spring. Water temperature has no effect on the color and should be applied monthly or as needed to maintain a true-blue appearance all season long. Heavy rain and/or intense sunlight may require additional treatments of pond dye. Two single packets of Midnight Blue will treat up to one surface acre 4’ – 6’ deep, for several months, depending on rainfall. We cannot ship to the following states: Alaska; Hawaii; Maine; Massachusetts; Minnesota; Montana; New Hampshire; New Jersey; New York; Oregon; Rhode Island; Vermont; Washington State.