AquaCal AutoPilot ST-220 Fan Assembly (630-ST) calvertengineering An impeller is useful because

An impeller is useful because it helps drive water through the pump housing

and surface-contact cleaning

and control response

This version is a practical choice when you need to keep the original threaded plumbing relationship intact

supporting safer and more dependable operation of connected equipment

AquaCal AutoPilot ST-220 Fan Assembly (630-ST) calvertengineering An impeller is useful becauseThe AquaCal AutoPilot ST 220 fan assembly is designed for compatible chlorination system applications where internal cooling airflow is needed to support the electronics. A fan assembly is useful because it helps reduce heat buildup inside the unit, which can contribute to steadier operation and better long term component protection. This replacement is especially useful when the original fan has become noisy, weak, seized, or completely