Pump runs but pressure at the filter gauge is much higher than normal

Safety first: Turn off the pump before adjusting valves or servicing the filter.

• Backwash or clean filter: For sand or DE filters, perform a full backwash per manufacturer instructions. For cartridge filters, remove and hose off or replace cartridges.
• Open return valves: Ensure all return-side valves are fully open to reduce backpressure.
• Inspect return fittings: Check pool return eyeballs for obstructions or overly small openings; adjust or replace as needed.
• Verify pump sizing: Confirm the Harris pump is not oversized for the existing plumbing and filter; excessive flow can raise pressure.

Operate the pump at a lower speed on variable-speed models to reduce system pressure if needed.