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The maker doses this by schedule rather than by a fixed potency, so the calculator cannot use it. Follow the directions below.
Expert use only: 1 drop (0.05 ml) per 40 US gal once or twice a week as a booster on top of Iodide or Sustain; test and keep 0.04-0.06 ppm.
• Very strong: even slight overdose can close stony corals
• Overdose can be neutralized with Continuum Fraction
Potassium iodide + free iodine; concentration not published, so no potency.
continuumaquatics.com/marine_i/reefbasis_lugolsex.php