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Brine Tanks and Softener Salt: How They Work, Sizes and Upkeep

Herritech engineering teamUpdated 30 September 20263 min read

Brine Tanks and Softener Salt: How They Work, Sizes and Upkeep
Quick answer: The brine tank holds salt and water that the softener uses to clean (regenerate) its resin. Choose a tank that holds at least a few regenerations of salt so it is not refilled too often, keep salt visible above the water level, and use clean softener salt so the valve and resin stay free of dirt.
Key facts
  • Brine = salt dissolved in water, used to regenerate the resin
  • Keep salt topped up so it is always visible above the water
  • Use clean softener salt; dirty salt blocks the brine valve
  • A float valve stops the brine tank overflowing
On this page
  1. Brine tank prices
  2. How regeneration works
  3. Which size?
  4. Softener systems
  5. Upkeep checklist
  6. Frequently asked questions

Brine tank prices

Current listed prices incl. VAT (updated 30 September 2026).

How regeneration works

  1. The control valve backwashes the resin vessel.
  2. It draws brine from the brine tank through the resin, replacing hardness with sodium.
  3. It rinses the resin and refills the brine tank with water ready for next time.

Which size?

Match the brine tank to the softener size and how often it regenerates: bigger softeners and harder water use more salt per week. Round and square 60–80 litre tanks suit most small and medium softeners; large conic tanks suit big industrial units.

Softener systems

Current listed prices incl. VAT (updated 30 September 2026). Full range: Water softeners price list.

Upkeep checklist

More: do I need a water softener?

Frequently asked questions

What does a brine tank do?

It stores salt water that the softener uses to regenerate its resin.

How often should I add salt?

Keep salt visible above the water; how often depends on water hardness and usage.

What is a salt bridge?

A hard crust of salt that stops salt dissolving; break it up so the softener regenerates properly.

Can I use table salt?

Use proper softener salt; fine or dirty salt can clog the brine system.

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