In this article, you can read more about what hard water is, how ion exchange works and how to choose the right product for your system.
The key points — a quick summary:
- Hard water contains high levels of calcium and magnesium, which build up as limescale
- Ion exchangers replace these minerals with sodium ions, softening the water
- Salt tablets regenerate the ion exchanger so it continues to work
- Tablets are preferable to granules in most systems — they dissolve more slowly and provide more consistent regeneration
- Relevant applications: waterworks, treatment plants, industry, plumbing installations and pools/spas
What is hard water and why is it a problem?
Hard water contains high concentrations of calcium and magnesium. These minerals occur naturally in groundwater and surface water, and levels vary significantly depending on geology and region.
For industry and commercial operations, hard water is an operational risk — not just a nuisance. Typical consequences include:
- Limescale deposits in heat exchangers and cooling systems that reduce efficiency
- Blocked nozzles and valves requiring frequent servicing
- Shorter service life for pumps and heating systems
- Higher energy consumption as equipment has to work harder
If you work as a plumber or facilities manager, you probably recognise the problem — and what it can cost when it's left untreated for too long.
"Water softening is one of the simplest ways to extend the service life of process equipment. With a consistent supply of salt tablets and the right regeneration cycle, you avoid most limescale problems before they occur," says Thomas Davidsen at Saltimport.
We supply salt tablets to customers across Norway, with fast delivery from terminals along the coast.
How ion exchange works in practice
An ion exchanger contains a special resin that binds to calcium and magnesium ions in the water and replaces them with sodium ions. The result is soft water, free from the minerals that cause limescale problems.
The process in brief:
- Hard water passes through the ion exchange resin
- Calcium and magnesium bind to the resin
- Sodium ions are released and follow the water onward
- The resin gradually becomes saturated and must be regenerated with brine
- The salt tablets dissolve and produce the brine that rinses the resin clean
After regeneration, the ion exchanger is ready for another cycle — and it's precisely this cycle that makes a consistent supply of salt tablets so important for operational reliability.
Have questions about salt tablets for your system? Get in touch for a chat with one of our salt experts.
Salt tablets or granules: which should you choose?
Both products do the same job, but behave differently in the tank.
Salt tablets:
- Dissolve more slowly and in a controlled manner
- Provide consistent, predictable brine concentration
- Produce minimal sludge and dust
- The standard choice for most professional installations
Granules:
- Dissolve faster — useful when rapid regeneration is needed
- May suit systems where the tank geometry doesn't work well with tablets
- Produce slightly more sediment over time
"Tablets are the first choice for most of the systems we supply. It comes down to predictability — you know what you're getting, and the system needs less monitoring between regeneration cycles," says Thomas Davidsen.
For waterworks, treatment plants and larger industrial systems, we recommend salt tablets as the default. Feel free to have a chat with one of our salt experts if you're unsure what suits your system.
Is your system a good fit for salt tablets?
Salt tablets for ion exchangers are relevant across a wide range of professional applications:
- Waterworks and treatment plants handling large volumes with strict water quality requirements
- Industry and offshore operations where hard water affects process equipment, cooling circuits and steam systems
- Plumbers and HVAC installers who install and maintain softening systems in commercial buildings and housing associations
- Facilities managers and building operators running central heating systems, laundries or canteens
- Pools and spas where limescale damages pumps, nozzles and heating systems
Frequently asked questions about salt tablets and water softening
What is hard water?
Hard water contains high concentrations of calcium and magnesium. These minerals build up as limescale in pipes and equipment, leading to higher energy consumption and a shorter service life for pumps and heating systems.
How do I know if my water is hard?
Your local waterworks can tell you the hardness level in your area. Visible signs include limescale deposits on surfaces, reduced pressure in nozzles and poor soap lathering.
What is the difference between salt tablets and granules?
Salt tablets dissolve more slowly and provide more consistent regeneration with less sludge. Granules dissolve faster and are suited to systems that require rapid regeneration. For most professional installations, tablets are the standard choice.
How often does an ion exchanger need to be regenerated?
It depends on the hardness of the water and the demand from the system. Most ion exchangers regenerate automatically. Check your system's documentation or contact your supplier.
Can I use regular table salt in the ion exchanger?
No. Table salt contains additives that can damage the ion exchange resin. Always use salt tablets or granules specifically produced for water treatment.
Which systems use salt tablets?
Waterworks, treatment plants, industry, commercial buildings with central heating systems, and pools/spas. What they have in common is the need for a consistent supply of the right product.
Where can I buy salt tablets for water treatment?
You can order directly at salt.no. If you're unsure which product best suits your system, get in touch with our salt experts.
