1Increase oxygen, suitable for fish tank, aquarium. 2The air output is large and uniform, fine bubble and high dissolved oxygen. 3If the fish tank water depth exceeds 40cm, the power of the air pump can be increased appropriately. 4Under the condition that all the accessories of the air pump are connected well, repeatedly unplug the tube of the back door of the finetuning valve, let the tube add water, can quickly achieve the effect of atomization. 5Two different type for you to choose, meet your different needs.