Ion Exchange Softener & Resin Volume Calculator
Size industrial Strong Acid Cation (SAC) water softener resin beds, calculate total hardness grains removed, salt regenerant consumption, and cycle service runtimes.
Water Hardness & Daily Flow Demand
Resin Capacity & Brine Regeneration
Resin Sizing & Chemical Demand
Recommended Tools & Equipment
Tested hardware and components for high reliability
Frequently Asked Questions
How does an ion exchange water softener remove hardness?
A water softener contains spherical beads of Strong Acid Cation (SAC) polystyrene resin charged with mobile sodium ions (Na+). As hard water containing calcium (Ca2+) and magnesium (Mg2+) percolates through the bed, the resin exhibits a stronger chemical affinity for the divalent calcium/magnesium ions, locking them onto the resin matrix while displacing harmless sodium into the water.
Why does salt regenerant dosage govern operating capacity?
Increasing the salt dosage from 6 lb/cu ft to 15 lb/cu ft of resin drives more sodium onto the exhausted beads via mass action, increasing operating capacity from ~20 kgr/cu ft to ~30 kgr/cu ft. However, salt efficiency collapses: 6 lb dosage yields ~3,300 grains/lb NaCl, whereas 15 lb dosage drops efficiency to ~2,000 grains/lb NaCl.
What is hardness leakage and how is it minimized?
Hardness leakage is the residual trace concentration of Ca2+/Mg2+ (typically 1 to 5 ppm) that slips through into treated water during service. It is minimized by: 1) Increasing regenerant salt dosage; 2) Utilizing counter-current (upflow) regeneration where brine enters from the bottom of the bed, ensuring the bottom effluent layer of resin is 100% fully regenerated.