Definitions for "Power head"
An electric pump that connects to the under gravel filter tubes to greatly increase the water flow.
A small submersible pump with only one moving part called the impeller. They are useful to create current within a tank (via a wavemaker) or to drive filters such as under gravel filters, canisters and protein skimmers.
A small submersible electric pump. Often used in conjunction with Filter or UGJ systems.