Softener emits unusual odour from brine tank or softened water

Safety: Do not drink water that smells foul until the system is sanitised.

Steps:

• Clean brine tank: Empty the brine tank, remove sludge, and wash with a mild bleach solution. Rinse thoroughly before refilling with clean salt.
• Sanitise resin: Follow Vaillant's sanitisation procedure, typically involving a measured dose of disinfectant during regeneration.
• Increase regeneration frequency: Ensure the unit regenerates often enough to prevent stagnation, especially in low‑use properties.