Answer:

Yes. Nitrogen can be removed from the pool. However, some forms of nitrogen are much more difficult to remove than others. First, all organic contaminants contain some nitrogen. Leaves, grass, oils, sweat, urine, etc. contain nitrogen compounds such as urea and ammonia. These contaminants can be removed with an effective sanitizer/oxidizer such as chlorine. Shock or superchlorination (adding an extra large dose of chlorine - 5 to 10 ppm) may be required. Other forms of nitrogen, such as nitrate nitrogen, can be much more problematic. These can also be removed, but may require a more drastic removal process such as draining part of the water and refilling with fresh, nitrate-free water.