20.07.2026

Water Softener or Water Purifier? What Is the Difference, and Which One Do You Need?

The terms water softener and water purifier may sound similar, but the two systems are designed to solve fundamentally different problems. One primarily helps manage hard water and limescale formation, while the other treats the water used for drinking and cooking.

How can you tell whether you need a water softener, a water purifier, or perhaps both? This article explains the main differences, how the two technologies work, and the factors worth considering before making a decision.

What Is the Main Difference Between a Water Softener and a Water Purifier?

A water softener primarily reduces the amount of calcium and magnesium ions that cause water hardness. As a result, it can help reduce limescale formation in household pipes, appliances, and on different surfaces.

A water purifier, on the other hand, is generally used to treat water intended for drinking and cooking. Depending on the selected filtration technology, it may reduce sediments, substances that cause unpleasant tastes or odours, and other specified components.

Put simply:

• a water softener treats the hardness of the water used throughout the household;

• a water purifier aims to improve the quality and taste of the water you consume.

Water hardness is mainly determined by the amount of dissolved calcium and magnesium in the water. Hard water does not necessarily pose a health risk, but it can cause limescale deposits and other inconveniences around the home.

What Does Hard Water Mean?

As water moves through its natural cycle, it passes through different layers of rock and soil. During this process, it can dissolve minerals, including calcium and magnesium. The higher the concentration of these minerals, the harder the water is considered to be.

The most common signs of hard water include:

• white limescale deposits on taps and showerheads;

• stains remaining on glasses and glass surfaces;

• rapid limescale build-up in kettles;

• deposits forming inside water-using household appliances;

• more time needed to clean bathroom and kitchen surfaces;

• soap and some cleaning products producing less foam.

Limescale can be particularly problematic in appliances that heat water, because the minerals responsible for hardness can precipitate and form deposits more easily during heating.

What Is a Water Softener Used For?

The purpose of a water softener is to treat hard water. One of the most commonly used technologies in household water softeners is ion exchange. During this process, the system replaces the calcium and magnesium ions responsible for water hardness with other ions, typically sodium ions.

A water softener is usually connected to the main water supply of a house or apartment. This means that softened water can be available at several points throughout the system, rather than at just one tap.

A properly selected and configured water softener can help:

• reduce limescale formation;

• decrease deposits on taps and glass surfaces;

• reduce the time spent removing limescale;

• protect water-using household appliances;

• make bathrooms and kitchens easier to keep clean;

• improve the efficiency of certain detergents and cleaning products.

The Pure Life WSL25 and WSS12 water softener is a fully automatic system. According to the product information, it uses ion exchange to reduce the amount of calcium and magnesium ions in the water and provides softened water for the household.

When Might a Water Softener Be Recommended?

It may be worth considering a water softener if:

• large amounts of limescale regularly form in your home;

• your kettle, coffee machine, or other appliances require frequent descaling;

• taps and shower enclosures quickly become stained;

• you want to treat the hard water entering your home through a central system;

• you want to reduce cleaning and maintenance tasks related to limescale.

Before choosing a water softener, it is advisable to measure the hardness of your water. The size and settings of the system should be adjusted to local conditions and the household’s water consumption.

Our experts can provide professional assistance through a free, no-obligation assessment.

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What Is a Water Purifier Used For?

Water purifiers are primarily designed to treat water used for:

• drinking;

• cooking;

• making tea;

• making coffee.

The way individual devices work can vary significantly. Available technologies include:

• mechanical filters;

• activated carbon systems;

• membrane-based solutions;

• UV-based devices;

• systems combining several treatment methods.

It is therefore not enough simply to decide that you want a water purifier. You also need to determine exactly which problem you want to address.

Relevant considerations may include:

• an unpleasant taste or smell in the water;

• sediment entering from the water network;

• the condition of the building’s internal pipework;

• the treatment of a specific water-quality parameter;

• reducing the use of bottled water;

• having conveniently available, locally treated drinking water.

According to the NNGYK, selecting the appropriate water purification technology depends greatly on the quality of the local drinking water and the specific issue that needs to be addressed. Before purchasing a system, it is advisable to review the data provided by the local water supplier and, if necessary, request testing from an accredited laboratory.

How Does a Reverse Osmosis Water Purifier Work?

Reverse osmosis, often abbreviated as RO, is a membrane-based water treatment process. Water is pushed through an extremely fine membrane under pressure. The membrane allows water molecules to pass through while restricting the passage of many dissolved substances and contaminants.

Reverse osmosis systems often combine several filtration stages. These may include:

• a mechanical pre-filter;

• an activated carbon filter;

• a reverse osmosis membrane;

• a post-filter;

• UV or UVC technology.

According to the manufacturer’s description, the Pure Life WGT water purifier uses a five-stage reverse osmosis filtration system and a UVC-LED module. Thanks to its slim, 10-centimetre-wide design, it can also be installed in smaller kitchens.

A water purifier should always be operated and maintained according to the instructions in the user manual. Delayed replacement of used filters or improper operation may negatively affect the quality of the treated water.

The NNGYK also recommends choosing equipment that has the required drinking water safety authorization.

Water Softener and Water Purifier: Comparison

Criteria Water Softener Water Purifier

Does a Water Purifier Eliminate Limescale?

Certain water purification technologies, such as reverse osmosis, may reduce part of the mineral content of the treated water. However, this effect only applies at the point of use connected to the purifier.

A kitchen water purifier therefore does not automatically protect:

• bathroom taps;

• shower enclosures;

• washing machines;

• boilers;

• the entire household water network.

If limescale formation throughout the entire home is the main problem, a central water softening system is generally required.

Does a Water Softener Purify Drinking Water?

A water softener is not the same as a drinking water purifier. Its primary function is to treat the ions that cause water hardness, rather than to remove every possible component from drinking water.

For this reason, a water softener alone does not replace a properly selected water purification system.

If the taste, smell, or a specific water-quality characteristic of your drinking water is the issue, a separate water purification solution may be required.

Can a Water Softener and a Water Purifier Be Used Together?

Yes. The two systems are not necessarily alternatives; they can also complement each other.

In this case:

1. the water softener centrally treats the hard water entering the household;

2. the water purifier separately treats the water used for drinking and cooking in the kitchen.

Combining the two systems can be practical when you want to reduce limescale formation throughout the home while also having a separate solution for treating the water you consume.

The system should always be designed by a professional, as several factors must be considered:

• the composition of the water;

• water pressure;

• household water consumption;

• the layout of the pipe network;

• the technical requirements of the individual devices.

Water Softener or Water Purifier: Which Should You Choose?

The first step is to identify the problem you want to solve.

You Probably Need a Water Softener If:

• limescale forms quickly throughout the household;

• you frequently need to descale appliances and surfaces;

• you want to protect water-using household appliances;

• you are looking for a central solution for treating hard water.

You Probably Need a Water Purifier If:

• you primarily want to treat water used for drinking and cooking;

• you are concerned about the taste or smell of tap water;

• you want to reduce your use of bottled water;

• you are looking for a targeted solution to a specific water-quality issue.

Both Systems May Be Useful If:

• the water is hard and the drinking water also requires treatment;

• you want a comprehensive water treatment system optimized for separate tasks;

• you want to protect household appliances while also having locally treated drinking water.

What Should You Check Before Making a Purchase?

Before choosing a water softener or water purifier, consider the following steps.

1. Find Out About the Quality of Your Local Water

Water composition can vary by location and may also be affected by the condition of the internal pipe network within the building.

You can request information from your local water supplier. For a more detailed assessment, testing by an accredited laboratory may also be considered.

2. Measure the Hardness of the Water

A simple water-hardness test can give you an indication of how hard the water in your household is.

3. Identify the Problem You Want to Solve

Different systems are needed for:

• reducing limescale;

• addressing unpleasant taste;

• reducing sediment;

• treating a specific water-quality parameter.

4. Check the Authorizations

When choosing a drinking water post-treatment system, check whether the device has the necessary NNGYK authorization and review the conditions of use specified in its documentation.

5. Consider Maintenance Requirements

Water treatment systems can only operate reliably if the maintenance, filter replacement, and disinfection schedules specified by the manufacturer are followed.

Summary

A water softener and a water purifier perform two different functions.

A water softener primarily contributes to more convenient household operation by treating hard water and reducing limescale formation.

A water purifier, on the other hand, provides a targeted solution for treating the water used for drinking and cooking.

The right choice depends on:

• the composition of the local water;

• where and in what quantity you want to treat the water;

• whether the main concern is limescale, the taste and quality of drinking water, or a specific water-quality parameter.

If limescale is a problem throughout your home, the WSL25 or WSS12 water softener may provide a central solution.

If you primarily want to treat water used for drinking and cooking, discover the WGT reverse osmosis water purifier.

Not Sure Which System Is Right for Your Home?

Request a free consultation to identify the most suitable solution based on:

• local water quality;

• the size of your household;

• your water-use habits.

Frequently Asked Questions

What Is the Difference Between a Water Softener and a Water Purifier?

A water softener primarily treats the calcium and magnesium ions that cause water hardness. A water purifier is designed to improve specific characteristics of the water used for drinking and cooking.

Might I Need Both a Water Softener and a Water Purifier?

Yes. A water softener can reduce limescale formation throughout the household, while a water purifier can separately treat the water consumed in the kitchen.

Does a Water Purifier Eliminate Limescale Throughout the House?

No. A kitchen water purifier only treats water at the point of use to which it is connected. A central water softening system may be required to address limescale throughout the household.

How Can I Tell Whether My Water Is Hard?

Water hardness can be checked using a home test strip or testing kit. For more accurate results, laboratory testing can be requested. The water-quality data provided by the local water supplier may also be useful.

How Often Do the Systems Need Maintenance?

Maintenance frequency depends on:

• the type of device;

• water quality;

• the intensity of use.

Always follow the maintenance intervals and instructions specified in the manufacturer’s user manual.