What Are Water Softener Salt Tablets and Why Do You Need Them?
If you have a water softener at home or at your business, you will probably already know that it needs a regular supply of salt. But what exactly are water softener salt tablets, what do they do and why are they such an important part of keeping a water softener working properly?
Water softener salt tablets are compressed tablets of salt designed for use in compatible water-softening systems. They are placed inside the softener's brine tank and are used during a process called regeneration.
In this guide, we explain how salt tablets work, why your water softener needs them and what to consider when buying salt for your system.
What Are Water Softener Salt Tablets?
Water softener salt tablets are compact tablets of salt specifically produced for water-softening equipment.
Rather than being loose like ordinary table salt or granular salt, the salt is formed into tablets that are easy to handle, store and add to a water softener's brine tank.
They are commonly supplied in larger bags, including 25kg bags of salt tablets, making them suitable for both domestic and commercial users.
The tablets gradually dissolve in water inside the brine tank, creating the salt solution that the water softener needs during regeneration.
Why Does a Water Softener Need Salt?
A water softener works by removing minerals such as calcium and magnesium from hard water.
Inside the softener is a resin that attracts these hardness minerals as water passes through the system.
Over time, the resin becomes loaded with calcium and magnesium and needs to be refreshed.
This is where salt comes in.
The softener uses a strong salt-water solution, known as brine, to regenerate the resin. During this process, the accumulated hardness minerals are flushed away so that the resin can continue softening your water.
Without sufficient salt, the regeneration process cannot work as intended.
What Happens if Your Water Softener Runs Out of Salt?
If the salt level becomes too low, the water softener may no longer be able to regenerate effectively.
That can eventually mean hard water starts passing through the system again.
You may begin to notice some of the familiar signs of hard water returning, such as:
increased limescale around taps and shower screens
reduced lather from soaps and shampoos
scale forming inside kettles and appliances
water marks becoming more noticeable
the water feeling different when washing or showering
For that reason, it is sensible to check the salt level regularly rather than waiting until the brine tank is completely empty.
How Often Should You Add Salt to a Water Softener?
There is no single answer because salt consumption varies from one property to another.
Several factors can influence how quickly a water softener uses salt, including:
the hardness of the incoming water
the amount of water used
the number of people in the property
the size of the water softener
how frequently the system regenerates
the settings of the particular softener
A larger household using more water will usually require more frequent regeneration than a property with lower water usage.
The best approach is to check your salt level periodically and become familiar with how quickly your particular system uses it.
If you're trying to decide how much salt to order, you can also read our guide:
Why Are Salt Tablets Used Instead of Ordinary Salt?
Salt used in a water softener should be suitable for the purpose and recommended for the specific equipment.
Water softener salt tablets are manufactured so that they can dissolve within the brine tank and support the regeneration process.
They are also convenient to store and pour into the softener compared with very fine loose salt.
You should not simply add household cooking salt to a water softener.
Different water softeners can also require different forms of salt, so always check the manufacturer's instructions for your particular model.
Salt Tablets vs Block Salt vs Granular Salt
There are several different forms of water softener salt.
Tablet salt
Tablet salt consists of compressed salt tablets and is widely used in many domestic and commercial water softeners.
Block salt
Block salt is supplied in larger solid blocks and is used by certain water softener systems specifically designed to accept it.
Granular salt
Granular salt consists of smaller loose crystals or granules and is suitable for some types of water-softening equipment.
One type is not automatically interchangeable with another.
If your water softener is designed for tablet salt, use the salt type recommended by the manufacturer.
We'll be covering the differences in more detail in an upcoming Salt Tablet Direct guide.
Are 25kg Salt Tablets a Common Size?
Yes. 25kg bags of water softener salt tablets are a common way of supplying larger quantities of tablet salt.
They allow customers to calculate their requirements easily and are suitable for storing a reserve supply so that the water softener does not unexpectedly run out.
At Salt Tablet Direct, customers can choose from multiple quantities of 25kg bags depending on their requirements.
For smaller domestic users, this might mean keeping several bags available.
For larger households, commercial properties and trade customers, purchasing in larger quantities can reduce the need to reorder as frequently.
How Should Water Softener Salt Tablets Be Stored?
Salt tablets should be stored somewhere dry and protected from moisture.
Ideally:
keep bags sealed until required
store them under cover
avoid leaving bags where rain or damp can reach them
keep them off wet floors where possible
choose somewhere convenient for carrying bags to the softener
A dry garage, utility area, storeroom or suitable commercial storage space can work well.
Because each bag can weigh 25kg, you should also consider how easily the bags can be safely moved from the delivery point to their storage location.
Can You Use Salt Tablets in Any Water Softener?
No.
Although tablet salt is widely used, not every water softener is designed for it.
Some systems require block salt, while others may recommend granular or tablet salt.
Before changing the type of salt you use, check the instructions for your water softener or contact the manufacturer or installer.
Using the correct type of salt is an important part of looking after the system.
Do Water Softeners Need Maintenance as Well as Salt?
Keeping the brine tank topped up is important, but it is only one part of looking after a water softener.
You should also periodically check the equipment, keep the area around it clean and follow any servicing or maintenance instructions provided by the manufacturer.
For more information, read:
Where Can You Buy Water Softener Salt Tablets?
Water softener salt tablets are available from water-treatment suppliers, plumbing merchants and specialist online suppliers.
When comparing suppliers, it is worth looking beyond the headline price of an individual bag.
Consider:
price per 25kg bag
total order cost
delivery charges
quantity options
availability
delivery arrangements
whether larger-volume or trade supply is available
Salt Tablet Direct supplies 25kg water softener salt tablets in a range of quantities for domestic, commercial and trade customers, with nationwide UK delivery.
Frequently Asked Questions
What are salt tablets used for in a water softener?
Salt tablets are used to produce the brine required during the regeneration process. This allows the softener's resin to continue removing hardness minerals from the water.
How much salt should be in my water softener?
Requirements vary by system. Check your manufacturer's instructions and monitor the salt level regularly rather than allowing the brine tank to run completely empty.
Can you put too much salt in a water softener?
Follow the filling guidance supplied with your particular water softener. There is no universal fill level suitable for every system.
Are water softener salt tablets the same as table salt?
No. Water softener salt is produced for use in water-softening equipment. Ordinary household table salt should not be treated as a substitute.
How long does a 25kg bag of water softener salt last?
It varies significantly depending on water hardness, water usage, household size and the efficiency and settings of the softener.
Can I buy water softener salt tablets in bulk?
Yes. Bulk quantities can be particularly useful for larger households, commercial properties and businesses that use significant amounts of softened water.
Keep Your Water Softener Supplied
Keeping an adequate supply of salt available helps ensure that your water softener can continue regenerating when required.
Salt Tablet Direct supplies 25kg water softener salt tablets in quantities suitable for domestic, commercial and trade customers.
Whether you need a smaller household order or a larger bulk delivery, you can choose the quantity that best suits your usage and available storage space.
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