Tropic Marin ATM10222 Sea Salt, 50 Gallon Tropic marine sea salt Tropic Marin Sea Salt contains all 70 trace elements in the natural concentrations of the ocean Because of the unique application of the mixed salt crystals, the trace elements remain completely usable in the water. Tropic marine sea salt Tropic Marin Sea Salt contains all 70 trace elements in the natural concentrations of the ocean Because of the unique application of the mixed salt crystals, the trace elements remain completely usable in the water Because of the unique application of the mixed salt crystals, the trace elements remain completely usable in the water