Aquabion softener occasionally allows hard water through before the next scheduled regeneration.

Safety first: No special safety concerns beyond normal electrical and plumbing precautions.

• Re-evaluate hardness: Test raw water hardness again; if it has increased, update the hardness setting in the Aquabion controller.
• Adjust reserve: Increase the reserve capacity or safety factor so the unit regenerates before the resin is fully exhausted.
• Monitor usage: If household occupancy or water use has increased, consider adjusting capacity settings or upgrading to a larger Aquabion unit.
• Check resin bed: If breakthrough occurs despite correct settings, the resin bed may be channeled or fouled and require professional evaluation.

Warning: Do not ignore intermittent hardness; it can cause scaling in heaters and fixtures.