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Lime

Calcium Oxide, Quicklime, or Burnt Lime used as a disinfectant for fish-holding facilities (produces heat and extreme alkaline conditions). Agriculture lime is used to increase the alkalinity of water in pond settings. Sodium bicarbonate is used to increase the alkalinity in water recirculating systems.

Liquid Oxygen

A form of oxygen cooled to a liquid state and used commonly in recirculating aquaculture systems because it is cheaper per unit than gaseous oxygen.