What is the main consideration in determining the length of the service stage of an ion exchange softener?

• A. Source Water Hardness
• B. Finished Water Hardness
• C. The Color And Taste Of The Water
• D. The Finished Water Use

Answer: (A)

The length of the service stage is determined primarily by the hardness of the water entering the softener. The resin’s job during service is to remove calcium and magnesium from incoming water, so the amount of hardness coming in directly uses up the resin’s capacity. If source water is very hard, the resin reaches its capacity sooner and must be regenerated sooner, shortening the service interval. If source water is softer, the resin lasts longer between regenerations, extending the service stage. Finished water hardness is the result after treatment, not the factor that sets how long the service cycle lasts. The color or taste of the water is unrelated to resin capacity, and while how much water is treated (finished water use) affects overall volume between regenerations, the primary determinant remains the hardness of the source water.