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Water Softener Calculator: Resin Size and Salt Use
Quick answer: Hardness to remove per day (grams) = hardness (mg/L) × water softened (m³). Resin needed = that load × days between regenerations ÷ the resin's capacity per litre. Salt per regeneration = resin litres × the salt dose. Resin capacity and salt dose depend on the resin and valve settings; the defaults are editable rules of thumb.
Key facts
- Daily load (g) = hardness (mg/L) × m³
- Resin = load × days ÷ capacity per litre
- Salt = resin litres × salt dose
- Capacity and salt dose are editable estimates
Softener Calculator
Example figures only: replace them with your own. Results update as you type.
Hardness removed per day (g)–
Resin needed (litres)–
Salt per regeneration (kg)–
Salt per month (kg)–
Default resin capacity and salt dose are typical planning figures; your supplier's resin data and valve settings give the exact numbers.
Where to Get the Figures
- Hardness: total hardness from a lab test, usually in mg/L as CaCO₃ (reading a test report).
- Daily use: from a water meter or the flow of the equipment you protect.
Softeners by Size
1 T/H 0844 H-Tech Water Softener MachineKSh 60,400
1 T/H 1054 H-Tech Water Softener MachineKSh 80,000
2 T/H 1254 H-Tech Water Softener MachineKSh 95,000
2 T/H 1265 H-Tech Water Softener MachineKSh 115,000
3 T/H 1465 H-Tech Water Softener MachineKSh 135,000
4 T/H 1665 H-Tech Water Softener MachineKSh 165,000
6 T/H 2069 H-Tech Water Softener MachineKSh 255,000
H-Tech 8T/H 2472 Water Softener MachineKSh 340,000| Product | Price |
|---|---|
| 1 T/H 0844 H-Tech Water Softener Machine | KSh 60,400 |
| 1 T/H 1054 H-Tech Water Softener Machine | KSh 80,000 |
| 2 T/H 1254 H-Tech Water Softener Machine | KSh 95,000 |
| 2 T/H 1265 H-Tech Water Softener Machine | KSh 115,000 |
| 3 T/H 1465 H-Tech Water Softener Machine | KSh 135,000 |
| 4 T/H 1665 H-Tech Water Softener Machine | KSh 165,000 |
| 6 T/H 2069 H-Tech Water Softener Machine | KSh 255,000 |
| H-Tech 8T/H 2472 Water Softener Machine | KSh 340,000 |
Current listed prices incl. VAT (updated 4 October 2026).
How sizing by flow works: softener sizing and prices. Salt and brine: brine tank guide.
Frequently asked questions
How do I calculate water softener size?
Multiply hardness by daily water use for the daily load, times days between regenerations, divided by resin capacity per litre.
How much salt does a water softener use?
Resin litres × salt dose per regeneration; the calculator shows per regeneration and per month.
How do I convert mg/L hardness to grains per gallon?
Divide mg/L by about 17.1.
How often should a softener regenerate?
It depends on hardness, water use and resin size; every few days is common.