Everything about Pond Aeration Everyone knows that pond with fish needs good amount of Oxygen. Life without oxygen is impossible and a pond with less amount of Oxygen can hold only less number of fish. To support large amount of fish in a captive pond, you need to provide external Air (which will contain Oxygen). Pond with fish will generate a huge amount of toxic air from the waste and decomposed material at the bottom and hence the bottom of the pond will always lack Oxygen. A lot of people use spray bars or fountains to re-circulate water thru fresh air by means if which Oxygen is added to the water. This was harmful gases will be released to the atmosphere and Oxygen gets added because the surface area of water getting in contact on the moving water will increase. Its always advisable to leave the surface (top) of the pond free from Water lilies and lotus plants because these plants cover the top, the maximum area will not have access to fresh air. Otherwise you need to have H...