Unlike venturis, air pumps require a power source; usually electricity from the mains.

Air pumps move a small amount of air at high pressure and speed.

One effective way to use them is to drive air through one or more airstones (perforated balls of rubber, sponge or ceramic) or membranes to create thousands of air bubbles deep in the pond. This is an ideal way for oxygen from the air to dissolve in the water, providing essential aeration.

However, the amount of dissolved oxygen achieved depends on the water temperature in your pond.