Water is a habitat not only for fish, but also for a lot of bacteria and plants. Similar to organisms on land, oxygen is necessary for them to survive. Fish and crustaceans have gills to absorb the oxygen for respiration. They need a minimum of 4 mg O2 per liter of H2O to survive without damage.
To avoid polluted water, it is possible to enrich the water with air. This is very advantageous for still waters like lakes or ponds, where no natural flow takes place. The aerator produces some water flow to enrich the water with air.
His Majesty King Bhumibol Adulyadej he modify the polluted water by enhancing the amount of oxygen to boost the function of bacterium in decomposing any organic matters in the water, clearing away the cause of deterioration. The aerator has been designed to allow the water to have some contact with the air. Each of its spraying paddles plunges into the water and lets it seep through the holes as the paddles rotate upwards into the air. Such rotation helps add the amount of oxygen and thus purify the water.