Water treatment/ CALCULATOR
Water-softener regeneration and salt estimate
Relate hardness load, daily treated volume and usable exchange capacity to an estimated regeneration interval.
Use a representative laboratory or validated field result expressed as mg/L as calcium carbonate.
Exclude water intentionally bypassed around the softener.
Use the manufacturer capacity for the programmed salt setting, not a maximum marketing figure.
Capacity intentionally held back for variable demand and measurement uncertainty.
Use the programmed salt dose or a measured refill history.
Use the equipment rating for the actual cycle and settings.
Daily hardness load
100 g/day
Estimated treated volume per cycle
10.2 m³
Estimated days between regenerations
25.5 days
Estimated regenerations per year
14.3 cycles/year
Estimated salt use per year
43 kg/year
Estimated regeneration water per year
2.1 m³/year
Interpretation:The planning interval is about 25.5 days, or 14.31 regenerations per year. Confirm it by measuring outlet hardness before breakthrough.
Constant hardness and daily softened-water use, with the stated working capacity available at the chosen salt setting. The estimate excludes iron, manganese and other competing ions, leakage targets, fouling, variable reserve logic, calendar overrides and brine-system faults. Manufacturer programming and measured outlet hardness govern operation.