Gissar på att ES står för EcoSmart. EcoSmart Nutrient Transport Mode (NTM) - A two phase program to promote maximum health and nutrient export, as well as increased growth for corals. Alternates between a resonant standing wave and a surge effect to stir up and export nutrients. EcoSmart Tidal Swell Mode (TSM) - Creates a harmonic balance in your aquarium reminiscent of the changing flow conditions that would be found in nature. Flow varies from left to right, right to left, calm, and ends with a great surge.