Pump runs but filter pressure is unusually high and flow at returns is weak.

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

Steps to correct:

• Backwash or clean filter: For sand or DE filters, perform a full backwash. For cartridge filters, remove and hose off or replace cartridges.
• Open valves: Ensure all return-side valves are fully open.
• Check heater bypass: Verify that any heater bypass or check valves are in the correct position and not restricting flow.
• Monitor pressure: Restart the Jacuzzi pump and note the clean filter pressure. Mark this as a reference for future maintenance.

If pressure remains high with a clean filter, consult a professional to evaluate system design and plumbing restrictions.