Pump housing or hoses vibrate and make a thumping sound when the pump starts or stops.

Safety first: Unplug the pump before adjusting hoses or valves.

• Support hoses: Secure Bestway hoses with straps or supports to reduce movement.
• Bleed air: Prime the pump thoroughly and run briefly with return fittings slightly loosened (if safe) to purge trapped air.
• Gentle operation: Avoid rapidly cycling the pump on and off. Allow a few seconds between stop and restart.
• Check valves: If a check valve is installed, ensure it is oriented correctly and not slamming; replace with a soft‑closing type if necessary.