Pond Injector Aerator

This is a pond aerator (or more accurately it is a type of injector) that attaches to your pump.

Basically the end with the two connectors is the top, the other is the bottom. You need to have the piece above the water to suck air (depending on how powerful your pump is).

Connect your pump to the top, and as water flows through it will draw in air.

This aerator also stops water siphoning back through the pump when it is off.

The more powerful your pump the more air that is sucked in