Harvey water softener causes banging pipes or water hammer when it changes cycles

Safety: Sudden pressure changes can stress plumbing. Do not ignore severe banging.

• Check pressure: Use a pressure gauge on a nearby tap to measure mains pressure. If above the Harvey specification (often around 6 bar max), install or adjust a pressure reducing valve.
• Secure pipework: Inspect visible pipes near the softener and secure any loose sections with proper clips.
• Install hammer arrestor: If banging persists, have a plumber fit a water hammer arrestor near the Harvey softener or main manifold.
• Schedule regeneration: Set regeneration to occur at night when water usage is low to minimize perceived noise.

Persistent severe water hammer should be evaluated by a professional plumber to prevent long-term damage to the Harvey softener and household plumbing.