Cygnet Select is an organic water dye that will color the water a deep rich aqua - blue color, very similar to Aquashade. Cygnet Select comes in one gallon containers; one gallon treats one acre, 4' deep. Cygnet Select is not E.P.A. registered and therefore can be used just about anywhere. Customers repeatedly tell us that they can't tell the difference between these Aquashade and Cygnet Select.