Pahlen Filter Bypass / Internal Filter Fault

Pahlén pool pump runs but there is sand or debris returning to the pool

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Damaged filter laterals, Cracked filter standpipe, Incorrect multiport valve position, Missing internal filter components

Safety first: Turn off the pump and relieve pressure before opening the filter or valve.

Check valve position: Ensure the multiport valve is firmly in the FILTER position and that the handle is not between positions.
Inspect internals: Open the Pahlén or compatible filter and inspect laterals and standpipe for cracks or dislodged parts. Replace damaged components.
Backwash thoroughly: Perform a long backwash and rinse cycle to clear fine debris from the filter bed.

Medium 3/5

Filter Lateral Assembly

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