Does Whole House Water Filters Remove Calcium? | 5 Best Water Filters to Remove Calcium from Water

Does Whole House Water Filters Remove Calcium?

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Water is an essential element in our everyday lives. However, not all water is created equal, and the quality of the water you drink and use in your home can significantly impact your health and well-being. Calcium is a kind of mineral that is found naturally in water. It is essential for survival because it helps strengthen bones and teeth, lower blood pressure, and protect against certain cancers.

On the other hand, you might not always want calcium present in regular water from the tap. One of the most common problems in water is the presence of calcium, which can lead to hard water and several plumbing issues. Does whole house water filters remove calcium? In this article, we will explore the effectiveness of whole-house water filters in removing calcium from the water and review the best water filters for calcium removal.

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Understanding Hard Water and Calcium

Hard water includes high quantities of minerals such as calcium, magnesium, and iron. These minerals can cause problems such as clogged pipes, water stains, and soap scum buildup. Calcium is one of the most common minerals found in hard water, and its presence can have several effects on water and plumbing. For instance, calcium can cause scale buildup in pipes and appliances, reducing efficiency and causing a shorter lifespan.

To specify if you have hard water and how much calcium is present in your water, you can perform a simple test using a water hardness test kit. These kits are widely available and can provide valuable information on the quality of your water.

Level of Hardness and Softness of Waters

General guidelines for the classification of waters are:

Soft Water:

0 to 60 mg/L (milligrams per liter) as calcium carbonate is classified as soft;

Moderately Hard:

61 to 120 mg/L as moderately hard;


121 to 180 mg/L as hard;

Very Hard:

More than 180 mg/L is very hard.

Does Whole House Water Filters Remove Calcium?
Does Whole House Water Filters Remove Calcium?

Types of Water Filters

Several types of water filters are available on the market, and each works differently to remove contaminants from water. Regarding removing the calcium, some filters are more effective than others. The most common types of water filters include:

Reverse Osmosis (RO) Systems

Reverse osmosis (RO) systems are one of the most effective forms of water filters for eliminating calcium from the water. These systems employ a semipermeable membrane to filter out minerals and pollutants, leaving only pure, clean water behind.

Water Softeners

Water softeners are another effective way of removing calcium from the water. These systems use ion exchange to replace calcium and sodium ions, making the water soft and minerals-free.

Gravity Filters

Gravity filters are simple and easy to use, and they work by using gravity to force water through a filter to remove impurities. These filters are less effective than RO systems or water softeners at removing calcium but can still significantly improve water quality.

Carbon Filters

Carbon filters work by utilizing activated carbon to extract pollutants from water. These filters are less effective than RO systems or water softeners at removing calcium, but they can still improve water quality.

Factors to Consider When Choosing a Water Filter

When choosing a water filter for your home, there are several factors to consider, such as:

Water Quality

The quality of your water will determine the type of filter you need. If you have hard water with high calcium levels, you may need a more powerful filter, such as an RO system or water softener.


Water filters come in a wide range of prices, so choosing one that fits your budget is essential. Remember that some filters may have ongoing maintenance costs that should be factored in.


Different types of water filters require different maintenance levels, so it’s essential to consider how much time and effort you’re willing to put into maintaining your filter. RO systems and water softeners require more maintenance than gravity or carbon filters.

Water Usage

The water you consume daily will also determine the filter you require. If you have a big home with heavy water consumption, you may need a more powerful filter to keep up with demand.

5 Best Water Filters for Calcium Removal

1. Ispring RO RCC7AK NSF Certified 75 GPD

The iSpring RCC7AK Alkaline 6-Stage Reverse Osmosis System is a high-quality under-sink water filtration solution. With its NSF certification and 75 gallons per day (GPD) capacity, this system ensures clean, great-tasting drinking water production. The 6-stage filtration process effectively removes impurities, including chlorine, calcium, sediment, and heavy metals, while the pH+ remineralization stage adds back essential minerals for enhanced taste and alkalinity. Designed for easy installation and maintenance, the iSpring RCC7AK provides a reliable source of superb-tasting drinking water at your sink. Experience the benefits of advanced reverse osmosis filtration with the iSpring RCC7AK system for improved water quality and taste.


  • Comprehensive Filtration
  • Alkaline Remineralization
  • NSF Certification
  • Easy Installation and Maintenance


  • Waste Water Generation
  • Requires Adequate Space
  • Initial Investment
iSpring RCC7AK, NSF Certified 75 GPD, Alkaline 6-Stage Reverse Osmosis System, pH+ Remineralization RO Water Filter System Under Sink, Superb Taste Drinking Water Filter
  • Certified to NSF/ANSI 58, 6-Stage Alkaline Remineralization Layered Filtration - Exclusively designed to restore the natural alkalinity and mineral...
  • GREAT-TASTING MINERAL WATER - A standard 5 stage RO system produces slightly acidic water with a pH of 7. 0 or below because the RO membrane removes...
  • LOW MAINTENANCE - Transparent 1st stage housing for easy visual inspection. Three extra long life pre-filters to remove large contaminants and protect...

2. APEC Water Systems ROES-50

The APEC Water Systems ROES-50 Essence Series is a top-tier reverse osmosis drinking water filter system that offers certified ultra-safe filtration. With its 5-stage filtration process and 50 gallons per day (GPD) capacity, this system effectively removes contaminants, including calcium, to provide clean and refreshing drinking water. The ROES-50 is designed with high-quality components and durable construction, ensuring long-lasting performance and reliability. With its easy installation and maintenance, this system is a convenient and efficient solution for improving the taste and quality of your drinking water. Experience the benefits of the APEC Water Systems ROES-50 Essence Series for superior and ultra-safe reverse osmosis filtration in your home.


  • Comprehensive Filtration
  • Ultra-Safe Certification
  • High Capacity
  • Easy Installation and Maintenance


  • Waste Water Generation
  • Space Requirements
  • Initial Investment
APEC Water Systems ROES-50 Essence Series Top Tier 5-Stage WQA Certified Ultra Safe Reverse Osmosis Drinking Water Filter System
  • Supreme quality - designed, engineered, and assembled in USA to guarantee water safety & your health.
  • Only technology to remove up to 99% of impurities including arsenic, chlorine, lead, fluoride, heavy metals, and 1000+ impurities. Max Total Dissolved...
  • WQA Certified System. Premium long-lasting filters used to treat tap water, well water. Provide unlimited clean, refreshing crisp tasting water...

3. Whirlpool WHAROS5 Reverse Osmosis (RO) Water Filtration System

The Whirlpool WHAROS5 Reverse Osmosis (RO) Water Filtration System is a reliable, convenient, clean, purified drinking water solution. Maintenance is hassle-free with its easy-to-replace UltraEase filter cartridges and extra-long filter life. The system’s compact design, measuring 14″ deep x 13″ wide x 15 inches tall, ensures it can fit in tight spaces under the sink. The included chrome faucet adds a stylish touch to your kitchen. Experience the benefits of reverse osmosis filtration with the Whirlpool WHAROS5 system and enjoy clean, great-tasting water at your fingertips.


  • Effective Filtration
  • Extra Long Filter Life
  • Easy-to-Replace Cartridges
  • Compact Design


  • Limited Water Output
  • Regular Maintenance
Whirlpool WHAROS5 Reverse Osmosis (RO) Water Filtration System With Chrome Faucet | Extra Long Life | Easy To Replace UltraEase Filter Cartridges, 14" deep x 13" wide x 15 inches tall, Blue
  • Safer water for you and your family: get our most advanced reverse osmosis system yet — the WHAROS5 filtration system is nsf certified to remove up...
  • Fresher tasting water: the WHAROS5 reverse osmosis filtration system removes odor causing agents for cleaner and better tasting water from your...
  • No more guesswork: ez-change indicator light tells you when it’s time to change the filter

4. Aquasana 3-Stage Max Flow Claryum Under Sink Water Filter

The Aquasana 3-Stage Max Flow Claryum Under Sink Water Filter System is a high-performance filtration solution that offers effective water purification. With its Claryum filtration process, this system removes up to 99% of chlorine and targets various contaminants, ensuring cleaner and healthier drinking water. The sleek and stylish design and the brushed nickel faucet add an aesthetic touch to any kitchen. Easy to install and maintain, this under-sink system provides convenient access to filtered water at your kitchen counter. Experience the benefits of the Aquasana AQ-5300+.55 in providing clean and refreshing water for you and your family.


  • Effective Filtration
  • Max Flow Design
  • Sleek Design
  • Easy Installation and Maintenance


  • Under-Sink Space Requirement
Aquasana 3-Stage Max Flow Claryum Under Sink Water Filter System - Kitchen Counter Claryum Filtration - Filters 99% Of Chlorine - Chrome Faucet - AQ-5300+.56 , White
  • Instantly Transform Tap Water Into Clean Extraordinary Water - Reduces up to 99% of 78 contaminants including chlorine, lead, pesticides, PFOA/PFOS, &...
  • High Flow Rate - This system powers through a half-gallon of water every minute. No need to wait for clean water compared to traditional drip filters.
  • Cost Efficient & Long Lasting - The most economical filter on the market at less than 10 cents per gallon filtered. Lasts for 6 months or 800 gallons...

5. Express Water Heavy Metal Whole House Water Filter – 3 Stage

The Express Water Heavy Metal Whole House Water Filter is a comprehensive 3-stage filtration system that effectively removes impurities from your home’s water supply. With sediment, KDF, and carbon filters, it targets contaminants such as sediments, heavy metals, chlorine, and odors, ensuring cleaner and healthier water. The system includes pressure gauges for easy monitoring, an easy-release feature for filter replacement, and 1-inch connections for seamless installation. Experience the benefits of the Express Water Heavy Metal Whole House Water Filter for improved water quality throughout your home.


  • Comprehensive Filtration
  • Improved Water Quality
  • Pressure Gauges and Easy Release
  • Easy Installation


  • Limited Filter Lifespan
  • Water Pressure Consideration
  • Space Requirements
EXPRESS WATER 3-Stage Heavy Metal Water Filtration System, Stainless Steel, Reduces Contaminants, Improves Water Quality, Comprehensive Filtration, High Versatility
  • Reduce Contaminants & Enjoy Clean Water: Get clean, safe water for your family using our 3-Stage Heavy Metal Water Filtration System. This advanced...
  • Improved Water Quality: Upgrade your water quality with our 3-stage water filtration system. Eliminate impurities and chemicals for a refreshing,...
  • Comprehensive Filtration: With 1" standard connections and quick-change cartridges, our in-house water filter system efficiently removes heavy metals,...


Removing calcium from water is essential to improve water quality and prevent plumbing issues. Whole-house water filters can effectively remove calcium, with RO systems and water softeners being the most effective. When choosing a water filter, consider factors such as water quality, budget, maintenance, and water usage to select the best filter for your needs. The Ispring RO RCC7AK, APEC Water Systems ROES-50, Whirlpool WHAROS5, Aquasana 3-Stage, and Express Water Heavy Metal Water Filters are excellent for removing calcium.

FAQs about Does Whole House Water Filters Remove Calcium?

Q: Can a whole-house water filter remove calcium from water?

Yes, whole-house water filters can remove calcium from water, with RO systems and water softeners being the most effective.

Q: What is the best water filter for removing calcium from water?

The best water filters for removing calcium from water include RO systems such as the Ispring RO RCC7AK and APEC Water Systems ROES-50, as well as water softeners such as the Whirlpool WHES30E and Afwfilters Built Fleck.

Q: Can hard water cause plumbing issues?

Yes, hard water can cause plumbing issues such as limescale buildup, which can lead to clogs, leaks, and other problems.

Q: Can I install a whole house water filter myself?

Installation of a whole house water filter can be done by a professional plumber or as a DIY project if you have some plumbing experience. However, it’s important to follow the manufacturer’s instructions carefully to ensure proper installation and operation.

Q: Are whole-house water filters expensive?

The cost of a whole-house water filter depends on the type of filter and its capacity. Carbon filters and gravity filters tend to be less expensive, while RO systems and water softeners can be more costly. However, the long-term benefits of improved water quality and reduced plumbing issues can outweigh the initial cost.

Q: Can water filters remove all contaminants from the water?

No, water filters can remove many contaminants from water, but not all. It’s important to choose a filter that targets the specific contaminants present in your water and to regularly test water quality to ensure effective filtration.

Q: Can water filters improve the taste and odor of water?

Yes, many water filters can improve the taste and odor of water by removing chlorine, sediment, and other impurities that can affect water quality.



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