How much resin for hard water?

by Niri

How many litres of water of hardness about 200 can be softened with one litre of resin?

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How much resin for hard water?

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Nov 20, 2010
 Resin Amount
by: Matt Ulrich - Clear Water Concepts

Niri, water softening resin is available in cubic feet or grains. Typically a bag of resin is 32,000 grains or 1.0 cubic feet. 32,000grains/1.0 cf of water softener resin can clean 32,000 grains of hardness before it has to regenerate with sodium or potassium chloride. I assume that your 200 hardness is referring to 200 ppm of hardness? In this case, divide 200 ppm hardness by 17.1 to get the grains. This would be 200/17.1=11.69 grains per gallon hardness.
32,000/1.0cf of resin would clean approximately 2,737 gallons of water with this hardness. 32,000/11.69=2,737 gallons cleaned.

Matt Ulrich
Clear Water Concepts
Mesa, AZ

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