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Breakthrough

The appearance in the effluent from a water conditioner of the material to be removed by the conditioner, such as hardness in the effluent of a softener, or turbidity in the effluent of a mechanical filter. An indication that regeneration, backwashing, or other treatment is necessary for further service.

Breakthrough

The appearance in the product water of an amount of the contaminant which exceeds the design performance criteria.