Patent No. EP3357868 (titled "Water Softening Device And Method To Operate A Water Softening Device") was filed by BWT on Feb 7, 2017. The application was issued on Mar 26, 2025.
A water softening device that automatically monitors and indicates the exhaustion state of its ion exchange resin filter. The device measures electrical conductivity of the treated water, which correlates with the ion exchange capacity of the resin. By continuously monitoring conductivity, the device detects when the resin's ion exchange capacity is depleted, indicating filter exhaustion. This approach eliminates the need for pH measurements and provides an immediate indication of filter condition, enabling proactive replacement before water quality issues arise.

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