6 Best Water Filters for Hard Water: Making Every Sip a Purer Pleasure

6 Best Water Filters for Hard Water: Making Every Sip a Purer Pleasure

Feeling the effects of hard water? Filter out the bad, keep the good with the right tools

a woman sitting on a stool smiling at the camera
By Tracy Little
Caitlin Snethlage
Edited by Caitlin Snethlage

Published June 3, 2024.

A glass of water with lemons on a cutting board and water filters in the background.

Ever feel like your soap isn't lathering as well as it should? Or notice a stubborn white buildup on your faucets? These could be signs of hard water lurking in your pipes.

Hard water, packed with calcium and magnesium minerals, can wreak havoc on your plumbing, appliances, and even your body. By understanding the impact of hard water and taking steps like using a proper filter, you can enjoy cleaner, smoother, and more efficient water flow throughout your home.

» Experience the benefits of the latest advancements in structured water using the MAYU Swirl Carafe

Our 6 Best Filters for Hard Water

  1. Best water filter overall - MAYU FULL CYCLE | Waterdrop K19
  2. Best water filter for capacity - Aquasana Rhino EQ-1000
  3. Best water filter for fast filtration - Brita Denali Water Pitcher
  4. Best water filter for mineral retention - SpringWell Whole House Water Filter System
  5. Best budget-friendly water filter - Culligan FM-25 Faucet Mount Filter
  6. Best water filter for eco-friendly design - Big Berkey Water Filter

Long-Term Benefits of Filtering Hard Water

Water filters are effective at reducing the harmful elements of hard water and improving the overall quality. Here's how:

  • Certain filters—particularly reverse osmosis systems—can significantly reduce fluoride levels in tap water—some by as much as 99.9%.
  • Due to the minerals in hard water, it can have a metallic or unpleasant taste. Filtration can improve the taste of your drinking water.
  • The improved quality and taste might encourage some people to drink more fluids, which can benefit digestion.
  • Hard water minerals can react with soap, leaving a film that dries out skin and hair. Filters can help remove it.
  • You might also see limescale buildup in pipes and appliances, which shortens their lifespan. Filters can prevent this buildup, saving you money on repairs and replacements.
  • Hard water can make soap lather harder, leading to dingy clothes. Filtered water allows for better cleaning and brighter colors.
  • Similar to laundry, dishes might have spots and film. Softening the water can help ensure they're sparkling.

Note: Different filters have varying capabilities. Simple carbon ones handle taste and odor, while hard water needs a more specialized filter. Consider your priorities before deciding to buy.

Best water filter overall


Mayu full cycle
Mayu full cycle
Mayu full cycle

MAYU FULL CYCLE | Waterdrop K19

FIlter, revitalize, remineralize



Filter replacement

12 months/1,000 gallons

Filter technology

Reverse osmosis

The Waterdrop K19 Reverse Osmosis System is part of the MAYU full cycle package, which uses a multi-stage process to treat your water and give you the best possible hydration.

Here's the step-by-step process:

  1. Filter removes a wide range of harmful contaminants, including hard water minerals, chlorine, and odors.
  2. Once filtered, you use the MAYU Swirl to enhance your water by improving its molecular structure.
  3. Finally, add the MAYU Drops before drinking to remineralize the filtered water.

RO filtration physically removes dissolved minerals through a semi-permeable membrane. It is more effective than other filters as it also removes other impurities.

The MAYU Swirl pulls in oxygen while balancing alkalinity—significantly improving the taste and texture.

Filtered water is stripped of all minerals—the bad and the good. Adding the MAYU mineral drops, which contain 75 minerals, enriches water with all the necessary minerals to maintain optimal health.

99.9% UV sterilization

Remineralized with 75 Ionic minerals and micro-elements

Structured water for improved health and taste

Requires countertop space

Best water filter for capacity


Aquasana Rhino
Aquasana Rhino
Aquasana Rhino

Aquasana Rhino EQ-1000



Filter replacement

Pre-filter 3–6 months/filter cartridges 6–10 years

Filter technology

Multi-stage process

The Aquasana Rhino EQ-1000 water filter system is suitable for high-volume households struggling with hard water. Its high capacity makes it ideal for those who use a lot of water.

This multi-stage filtration system boasts exceptional capacity. It has a lifespan of 10 years or one million gallons of water. This translates to significantly fewer filter replacements compared to other systems, minimizing waste and maintenance needs.

The Rhino EQ-1000's multi-stage approach removes a wide range of contaminants, leaving you with clean and delicious-tasting water, even with heavy usage.

High filtration capacity

Comprehensive filtration system

Salt-free water conditioning

High upfront cost

Requires professional installation

Best water filter for fast filtration


Brita filter
Brita filter
Brita filter

Brita Denali Water Pitcher



Filter replacement

40 gallons/2 months

Filter technology

Activated carbon and ion exchange resin

The Brita Denali Water Pitcher's design with a built-in filter makes it easy to use and store in your refrigerator. It effectively reduces hard water minerals and other impurities, leaving you with better-tasting water for drinking and cooking.

This Brita pitcher is particularly beneficial for its speed. The rapid filtration rate allows you to quickly enjoy fresh water without waiting. This is ideal for busy households who need quick and easy access.

While the initial purchase is budget-friendly, keep in mind that ongoing replacement filters add to the long-term cost.

Easy to use and maintain

Fast filtration rate

Portable design

Limited filtration capacity

Shorter filter lifespan

Best water filter for mineral retention


SpringWell filter
SpringWell filter

SpringWell Whole House Water Filter System



Filter replacement

Sediment pre-filter 3–6 months/filter media 6–10 years

Filter technology

Multi-stage process

The SpringWell Whole House Water Filter System is a comprehensive solution that prioritizes the health benefits of natural minerals. This system provides filtered water throughout your entire home, eliminating the need for multiple faucet filters.

The innovative technology tackles hardness issues in your water supply. Unlike some filters that remove all minerals, this system retains beneficial minerals while effectively reducing the ones that cause problems like soap scum buildup.

This multi-stage filtration process not only addresses hardness but also removes impurities and improves the overall taste and quality of your tap water.

Whole-house filtration

Retains beneficial minerals

Balanced water quality

High upfront cost

Requires professional installation and maintenance

Best budget-friendly water filter


Culligan filter
Culligan filter
Culligan filter

Culligan FM-25 Faucet Mount Filter



Filter replacement

2,000 gallons/2 months

Filter technology

Activated carbon and ion exchange resin

The Culligan FM-25 Faucet Mount Filter is a budget-friendly and convenient option for filtering and improving tap water quality, especially for renters or those who don't want to modify their plumbing.

Its compact design attaches directly to most standard faucets, providing filtered water on demand without taking up counter space.

The key benefit lies in its affordability, offering a cost-effective solution for cleaner water without sacrificing quality.

This filter tackles hard water and other impurities through a combination of activated carbon and ion exchange resin. The former removes chlorine and unwanted tastes, while the latter exchanges hardness minerals for sodium, resulting in softer, better-tasting water.

Affordable price

Easy installation

Compact design

Limited filtration capacity

May not fit all faucet types

Best water filter for eco-friendly design


The Berkey filter
The Berkey filter
The Berkey filter

Big Berkey Water Filter



Filter replacement

3,000 gallons

Filter technology

Microfiltration and adsorption

The Berkey BK4X2-BB prioritizes sustainability with its unique gravity-fed design. This eliminates the need for electricity, allowing you to purify water from natural sources like lakes and streams – perfect for outdoor adventures or off-grid living.

It has a minimal environmental impact, making it a great choice for the eco-conscious consumer.

Beyond its green design, the Big Berkey Water Filter shines in its ability to remove contaminants without relying on disposable filters. It effectively tackles hard water minerals, bacteria, and viruses.

It achieves this while preserving beneficial minerals that enhance taste and potentially offer health benefits. The replaceable filters and minimal maintenance also make it a sustainable and cost-effective option in the long run.

Eco-friendly design

No electricity required

Long-lasting filters

High initial cost

Requires countertop space

What to Look for in a Hard Water Filter

Before selecting a water filter, it's essential to test your water to determine the specific hardness level and identify any other contaminants present. This crucial step helps you choose the most suitable filter for your needs.

Here are vital considerations when choosing a filter to address hard water issues:

  • Effective Mineral Removal: Look for filters that employ methods like reverse osmosis or activated carbon to remove hardness-causing minerals like calcium and magnesium, alongside other impurities.
  • Ease of Installation and Maintenance: Prioritize user-friendly filters with minimal upkeep requirements. Ensure replacement parts are readily available for long-term maintenance needs.
  • Lifespan and Replacement Frequency: Consider the filter's lifespan and how often replacement media or cartridges are necessary. This can influence affordability and
  • Compatibility With Source: Different filter types, such as pitcher, countertop, or under-sink systems, are suited for various water sources. Choose one that aligns with your needs and available space.
  • Flow Rate: Opt for filters that offer a fast filtration process to minimize wait times and meet your household's water demand.
  • Certification: Consider filters certified by reputable organizations like NSF International for guaranteed performance and quality.

Don’t Just Filter—Remineralize

Hard water filtration effectively removes impurities, but it can also affect the water's mineral content. Certain minerals, like calcium and magnesium, are crucial for bone health, muscle function, and nerve transmission. These minerals may be reduced during the filtration process.

MAYU Essential Mineral Drops offer a solution by replenishing these minerals in filtered water—helping you maintain a more balanced mineral profile in your drinking water. Adding minerals may also influence nutrient absorption, potentially contributing to a well-rounded nutritional intake.

These minerals may also contribute to improved overall water quality by potentially influencing pH levels towards a more alkaline state. Research suggests that alkaline water may benefit digestion and hydration, although more studies are needed.

» Are you an athlete? MAYU Electrolyte Blend offers higher quantities of ionic minerals to help you recharge