How to Remove Salt from Water?

You’ve just  installed a salt-based water softener to reduce hardness. But now the water contains added sodium, and you’re wondering how to remove salt from water. If you’re limiting your salt intake or prefer the taste of pure water, removing that sodium becomes important.

While the sodium added by softeners isn’t the same as table salt, it can still affect taste or raise concerns; especially if you’re monitoring your sodium levels. That’s why many homeowners look for ways to filter it out after softening.

So, what’s next? If you’re looking for a water filter that removes sodium, reverse osmosis is your hero. It strips out sodium and delivers clean, crisp water, making your kitchen and your peace of mind feel lighter.

Why Is There Salt in Softened Water?

Sodium plays a critical part in the water softening process. There are two primary ways that the impact of hard water is dealt with in a residential setting: water softeners and water conditioners.

A water softener removes the mineral content of hard water and replaces it with a small number of sodium ions, while a water conditioner changes the minerals so they can’t cause scaling. Water conditioners are sometimes known as salt-free water softeners since the water conditioned by these systems doesn’t contain sodium. Learn the difference between a salt versus salt free water softener with our guide.

Understanding Ion Exchange

Water softeners function through a process known as ion exchange. Sodium plays a critical role in this process.

When water percolates through the soil and stone of Earth’s crust, it picks up mineral ions. These mineral ions, most often consisting of calcium and magnesium, bond to the water molecule. Once the water reaches your tap it has undergone a series of treatments, but those treatments don’t address the mineral content of the water.

Here is where an ion-exchange system comes in. These systems are usually installed where the main water line comes into your home after the water meter. And they contain at least two tanks: a brine tank and a resin tank.

This dual-tank setup is the secret behind continuous softening. While you use water throughout the house, the system can flush out accumulated hardness minerals, so it’s always ready for the next round.

The Role of the Resin Tank

The resin tank contains small, negatively charged resin beads that have sodium ions attached to them. As hard water is piped into the resin tank and passes over the resin beads, the positively charged mineral ions attached to the water molecule are attracted to the negatively charged resin.

When these mineral ions are drawn away from the water molecule, they are replaced with the sodium ions, which had previously been attached to the resin beads. The replacement of a positively charged mineral ion with a positively charged sodium ion allows the water molecule to retain an ionic balance.In a salt-based softener, sodium replaces calcium and magnesium in your water. This process removes the minerals that cause hardness, but leaves behind some sodium.

Why Flushing the System Matters

Over time, the resin beads in the tank will have a large number of mineral ions attached to them. If these ions are not flushed from the system, then eventually it will stop softening water.

In order to flush the system, salty brine in the brine tank is flooded into the resin tank. The salty water displaces the mineral ions from the resin, replacing them once again with positively charged sodium ions.

The brine solution containing the mineral ions is flushed from the system down the drain, and the system is ready to begin softening again.

If you are concerned about water conditioner salt or want to reduce sodium in your drinking water, understanding how this process works can help you choose the right follow-up filtration. Many homeowners ask what water filter removes sodium, and the answer often leads to reverse osmosis systems, which are highly effective at reducing salt from water.

Sodium Levels in Softened Water

Some people are skeptical about water softeners which use ion-exchange because of the sodium in the soft water they produce. This is understandable, particularly because the dangers of high-sodium diets have been discussed extensively over recent decades.

Not Table Salt—Just Sodium

To clear up any confusion, the soft water produced by these systems contains sodium (Na) and not table salt, sodium chloride (NaCl). The sodium added to the water doesn’t alter the taste of the water. Still, it is worth considering the impact of this sodium.

How Much Sodium Are You Really Getting?

For the average, healthy adult, the sodium content in soft water poses little risk. The exact sodium content of the water produced by your system will depend on how hard it is going into the system.

Harder water going into a water softener will have more sodium coming out of the system.

This happens because higher levels of water hardness require more sodium ions to replace the calcium and magnesium during the ion-exchange process. As a result, the salt from water increases slightly in proportion to the incoming hardness level.

A Simple Comparison

For example, water containing 10 grains per gallon (GPG) of calcium carbonate is considered very hard on the water hardness scale. Once softened, this water will contain only 74 milligrams (mg) of sodium in a quart of water or 298 mg per gallon. To put that in context, one gallon of soft water has only slightly more sodium than two slices of white bread or two cups of milk. In comparison to the sodium found in everyday foods, the sodium in softened water is minimal.

For most people, the sodium in softened water is negligible, much less than what’s in many foods or drinks you might have every day.

For those specifically limiting sodium or exploring ways to eliminate water conditioner salt, it helps to know what water filter removes sodium most effectively. Reverse osmosis remains the most popular solution for reducing salt from water while also targeting a wide range of other common contaminants.

Is Sodium in Soft Water Harmful?

So, is the sodium in soft water something to worry about? That depends on who’s drinking it.

Who Should Be Cautious

• Individuals with High Blood Pressure: Doctors frequently advise people with hypertension to watch their sodium intake closely, even tiny amounts in water can add up. While the sodium content in softened water is low, those aiming to lower their blood pressure often want to cut every bit possible.
• Anyone on a Sodium-Restricted Diet: People managing heart conditions, kidney disease, or other chronic health issues may need to avoid even trace sodium. For these individuals, switching to an alternative or adding a secondary filter makes sense.
• Infants on Formula: Babies’ bodies process sodium differently. If you’re using softened tap water to mix formula, that extra sodium can be a concern. Pediatricians often recommend purified or distilled water for newborns, especially for those with specific health risks.
• People with Weakened Immune Systems: Those recovering from illness or living with immune-compromising conditions are often advised to limit any potential irritants in their water, including sodium.
• Anyone Who Prefers Pure Taste or Has Wellness Goals: Even for healthy adults, taste and peace of mind matter. Some simply want water as close to pure as possible, no added minerals, no aftertaste, no doubts. For these households, reducing salt from water is about lifestyle, not medical necessity.

Is It Safe for Most People?

Yes. For the majority of healthy adults, sodium in softened water does not pose a health concern.

According to the American Heart Association, the recommended limit for daily sodium intake is no more than 2,300 milligrams per day. Most adults are encouraged to aim for a lower target of 1,500 milligrams per day for ideal cardiovascular health. In contrast, softened water typically adds only 20 to 30 milligrams of sodium per 8-ounce glass, depending on how hard the incoming water is.

To put that in perspective, a single slice of bread can contain more sodium than an entire quart of soft water. Still, for those seeking to reduce their overall intake or simply enjoy cleaner-tasting drinking water, reverse osmosis systems offer a reliable solution.

These systems are commonly recommended when people ask what water filter removes sodium effectively. They are especially helpful for households that want to remove both sodium and other dissolved solids from their water.

Understanding the role of sodium and how to manage it allows families to decide how much salt from water they want to keep or filter out. This approach gives you control over taste and wellness without sacrificing water quality throughout the rest of your home.

Source: American Heart Association

How to Remove Salt from Water

When sodium is present in softened water, removing it requires more than standard filtration. One of the most effective solutions is reverse osmosis. This is a proven method for reducing salt from water at the molecular level.

Reverse Osmosis (RO) as the Primary Solution

To understand reverse osmosis, it is helpful to start with the process of osmosis. Osmosis is all around us and is important for how our bodies function. To understand osmosis, picture two liquids on either side of a membrane.

Those liquids contain different amounts of dissolved substances.

On one side of the membrane, the solution has a high concentration of the dissolved substance, while the solution on the other side has a low concentration of the dissolved substance.

In osmosis, the liquid which has a low amount of the dissolved substance will flow across the membrane to the solution with a high amount of dissolved substances. This flow will continue until the liquid on both sides of the membrane contains an equal amount of liquid and dissolved substance. The force causing this flow is known as osmotic pressure.

Reverse osmosis is the exact opposite of this natural process. Desalination is the removal of salt from seawater and is an easy way to visualize reverse osmosis in action. When water is desalinated using reverse osmosis, saltwater is forced at high pressure across a semipermeable membrane.

How Reverse Osmosis Removes Salt from Water

In home systems, this same principle is used to reduce salt from water by applying pressure that exceeds the osmotic pressure. The membrane has tiny pores that allow only water molecules to pass through, leaving behind sodium ions and other unwanted substances.

This makes reverse osmosis one of the most effective ways to remove salt from water and reduce sodium introduced by water conditioner salt.

In order to force the water across the membrane, the pressure used in the system must exceed the osmotic pressure. The membrane used has pores large enough to allow water molecules through, but not large enough to allow sodium ions or many other contaminants through.

The result on the other side of the membrane is freshwater that has had the vast majority of sodium removed.

Point-of-Use and Whole-House RO Systems

These systems are typically installed as point-of-use (POU) units under a kitchen sink, where they provide clean drinking water directly from a dedicated faucet. While whole-house reverse osmosis systems do exist, they are far less common due to their higher cost and maintenance needs.

Still, for people wondering what water filter removes sodium most effectively, RO remains the gold standard.

What Else Does RO Remove?

Reverse osmosis systems are effective at reducing sodium content and removing salt from water. They also provide a deeper level of filtration for a wide range of common tap water contaminants.

In addition to addressing concerns about water conditioner salt, RO systems target:

• Volatile Organic Compounds (VOCs)
• PFAS (forever chemicals)
• Chlorine and chloramines
• Sediment and rust particles
• Bacteria and viruses (such as Salmonella and norovirus)
• Protozoa like Giardia
• Nitrates and heavy metals

Most RO systems use a multi-stage filtration process. This typically includes a pre-filter to remove sediment, the reverse osmosis membrane to filter out dissolved contaminants, and a post-filter made of activated carbon to improve taste and remove residual odors.

Other Methods for Removing Salt from Water

While reverse osmosis is the most practical and widely used option for reducing salt from water at home, there are a few other methods that can remove sodium under certain conditions. Each has specific advantages and limitations.

Distillation

Distillation works by heating water until it turns into steam, then collecting and condensing that steam back into liquid. This process separates water from most dissolved solids, including sodium and other minerals. Although effective at removing salt from water, distillation is slow and uses a significant amount of energy.

For this reason, it is not commonly used in household settings for daily drinking water.

Deionization (DI)

Deionization systems use resin beds to remove ionic contaminants like sodium, calcium, and magnesium by replacing them with hydrogen and hydroxide ions. The result is extremely pure water.

This method is common in laboratories and industrial applications, but it is less practical for home use. The resins must be regenerated regularly using strong chemicals, and the systems can be expensive to maintain. Deionization is not a cost-effective way to address water conditioner salt in residential settings.

Activated Carbon Filters

Activated carbon filters are excellent at improving the taste and smell of water. They reduce chlorine, chloramines, and volatile organic compounds (VOCs), which are common in municipal water supplies.

Do note that carbon filters do not remove sodium. They are not effective at reducing salt from water on their own. For homeowners searching for what water filter removes sodium efficiently, carbon filters are often used as a complement to reverse osmosis systems.

Together, they provide both chemical and mineral filtration, improving overall water quality.

Water Conditioner vs Water Softener

Not all water treatment systems function the same way. While water softeners use ion exchange to replace hardness minerals with sodium, water conditioners work differently and are often marketed as salt-free alternatives.

Salt-Free Water Conditioner Basics

Water conditioners alter the behavior of hardness minerals like calcium and magnesium rather than removing them.

Most systems use a method called Template Assisted Crystallization (TAC), which converts these minerals into microscopic crystals that do not stick to surfaces.

Unlike traditional softeners, water conditioners do not add sodium to the water. They also do not remove minerals, so the water still contains hardness, but without the scaling effects that damage pipes and appliances.

This makes them popular for people who want to avoid water conditioner salt while still controlling mineral buildup.

Pros and Cons of Water Conditioners

Can You Use a Water Softener and RO Together?

Many homeowners ask if it’s possible to soften their water and still remove sodium at the tap. The answer is yes, and the most effective setup combines both systems for full-home coverage and clean, great-tasting drinking water.

Point-of-Entry (Softener) + Point-of-Use (RO) Setup

You can combine a water softener with a reverse osmosis (RO) system to get the best of both worlds, soft water throughout the house and purified drinking water right where you need it. Here’s how this dual setup works:

• Install the ion-exchange water softener at the point of entry (POE): This means the softener treats all water as it enters your home, protecting your plumbing, appliances, and fixtures from scale buildup.
• Add a reverse osmosis system at the point of use (POU): The RO unit is typically installed under the kitchen sink or wherever you want the cleanest water for drinking and cooking.
• Worried about sodium from softened water?: The RO filter at the tap removes sodium and other dissolved solids, so your drinking water is both soft and pure.
• Enjoy the benefits of both systems: Soft water throughout the house for cleaning and bathing, and crisp, contaminant-free water at the faucet.

This setup lets you address water hardness and water purity without compromise.

How They Work Together

With this type of dual system setup, hard water enters your house and immediately enters the water softening system, where mineral ions are exchanged with sodium ions. This water is then piped throughout your home.

At the drinking water source, the softened water flows into the reverse osmosis system.

There, the sodium introduced by the softener, along with many other contaminants, is removed using a high-pressure membrane.

Before it hits the tap where you want to provide drinking water, the soft water enters the reverse osmosis system. Here, any sodium ions are removed, as well as a broad array of other contaminants.

This combination is ideal for most households. It gives you the benefits of both technologies: reduced scale from softened water and reduced salt from water at the tap. For those searching for what water filter removes sodium effectively while still preserving the advantages of water softening, this setup is the most complete solution available.

Using both systems in this way allows you to have the benefits of both soft water and water filtration. Softening your water ensures you won’t have to deal with the soap scum, scaling, and deposits that come with hard water. Water filtration using reverse osmosis gives you gallons of filtered, clean water.

How to Choose the Right System for Your Needs

Choosing the best water treatment system depends on your specific water quality concerns and how you use water in your home. While removing salt from water may be a priority, it’s often just one part of a bigger goal that includes reducing scale, improving taste, and protecting plumbing.

Key Questions to Ask

Before choosing a system, clarify what matters most for your home and family. Consider these essential questions:

• Do you need whole-house filtration or just cleaner water at specific taps?
  • Whole-house systems protect plumbing and appliances.
  • Point-of-use systems focus on drinking and cooking water.
• Is sodium reduction your main goal, or do you want to target other contaminants as well?
  • If sodium is your priority, ask: What water filter removes sodium effectively?
  • For broader filtration, consider systems that also reduce chemicals, odors, and microbes.
• Will you benefit more from a single unit or a paired solution?
  • Pairing a softener with reverse osmosis manages sodium and enhances overall water quality.

Best Practice Setup for Most Households

The best water solution often means combining technologies for whole-home protection and high-quality drinking water. Here’s how to do it:

• Install a water softener at the point of entry.
  • Reduces hardness minerals throughout the home.
  • Prevents scale buildup in pipes and appliances.
• Add a reverse osmosis system at the point of use.
  • Removes sodium, chlorine, PFAS, and more from your drinking water.
  • Ensures the purest water where it matters most.
• Result:
  • You enjoy softer water for cleaning and bathing, and exceptionally pure water for drinking; solving multiple water problems at once.

This combination covers all the bases, reducing salt from water and tackling a wide range of contaminants for total peace of mind.

Is Your Water as Clean and Safe as It Could Be?

Most people aren’t negatively affected by the sodium content of softened water, but it is important to recognize the options available to remove the salt from softened water or go with one of the best salt free water systems. The most common solution is to install a reverse-osmosis system to provide filtered, clean water.

The benefit of this solution is that not only will sodium be removed from your drinking water, but you’ll also have peace of mind knowing many other contaminants will be removed as well.

These include microbes like Giardia and Salmonella, nitrates, and PFAS.

To learn more about water softener alternatives and options for removing salt from your freshwater, please contact Rayne Water today.

FAQs

How do I remove salt from water that’s been softened?

The most effective way to remove salt from water that has been treated by a water softener is to use a reverse osmosis (RO) system. RO systems use a high-pressure membrane to remove sodium and other dissolved solids, providing clean, filtered water that’s safe for drinking and cooking.

Is water conditioner salt safe to consume?

Water conditioner salt is used in ion-exchange systems to help remove hardness minerals like calcium and magnesium. While it adds a small amount of sodium to your water, this isn’t the same as table salt and is generally considered safe for most people. However, if you’re on a low-sodium diet or just prefer the cleanest taste possible, you may want to use additional filtration like RO.

What water filter removes sodium best?

If you’re wondering what water filter removes sodium effectively, the answer is reverse osmosis. RO systems are designed to reduce sodium, along with a wide range of other contaminants, making them the go-to choice for households that want to improve both the taste and quality of their drinking water.