Noticeable water hammer or banging noises in pipes when the softener switches modes

Safety: Close inlet valve and relieve pressure before installing any new components.

• Check pressure: Measure inlet pressure. If it exceeds Grünbeck's recommended maximum, install or service a pressure reducing valve upstream.
• Slowly open valves: Ensure that manual shutoff valves are fully open and not partially throttling flow, which can worsen hammer.
• Install shock absorber: If not already present, have a plumber install a water hammer arrestor near the softener.
• Check bypass: Verify that the bypass valve is correctly set and not causing sudden flow changes when the softener switches.