H2ocean pro is a new pro formula aquarium salt produced by a solar evaporative process which produces a totally natural base salt where all of the main and trace elements and are in complete balance as nature intendedthe pure natural salt is then specially enhanced for aquarium use by elevating specific elements that over time become depleted such as calcium and magnesium which are used by corals and coralline algae for growthfree from nitrate and phosphateavailable sizes23kg bucket for