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The TLI is determined by measuring:\n- total nitrogen\n- total phosphorus\n- visual clarity\n- algal biomass.\n\nLakes are classified:\nTrophic Level 0-1 = Ultra-microtrophic\nTrophic Level 1-2 = Microtrophic\nTrophic Level 2-3 = Oligotrophic\nTrophic Level 3-4 = Mesotrophic\nTrophic Level 4-5 = Eutrophic\nTrophic Level 5-6 = Supertrophic\nTrophic Level 6-7 = Hypertrophic\n\nThe main trophic states determined by these indicators are:\n- Oligotrophic lakes are clear and blue, with very low levels of nutrients and algae.\n- Mesotrophic lakes have moderate levels of nutrients and algae.\n- Eutrophic lakes are green and murky, with higher amounts of nutrients and algae.\n- Supertrophic lakes are fertile and saturated in phosphorus and nitrogen, often associated with poor water clarity. Excessive phytoplankton growth can occur in ideal conditions - when there's a calm, hot and sunny period of a few weeks.\n- Hypertrophic lakes are highly fertile and supersaturated in phosphorus and nitrogen. 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