AquaCal AutoPilot ST-220 Fan Assembly (630-ST) calvertengineering and surface-contact cleaning

and surface-contact cleaning

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

Replacing a worn brush can help restore dependable cleaning performance and improve efficiency during maintenance work

This replacement is especially useful where the original top mount valve has failed or where the plumbing layout benefits from easier future access through the union connections

and control response

AquaCal AutoPilot ST-220 Fan Assembly (630-ST) calvertengineering and surface-contact cleaningThe 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