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

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

• Service the filter: Backwash sand or DE filters, or clean cartridge elements according to manufacturer instructions.
• Open valves: Ensure all return valves are fully open and actuators (if any) are in the correct position.
• Check for obstructions: Inspect return fittings and heater bypasses for blockages.
• Adjust pump speed: On variable‑speed AquaJet models, reduce RPM to a level that maintains adequate flow without excessive pressure.