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How to Determine the Right Size Water Softener for Your Home

Writer's picture: Eyal Gamili HoltzekerEyal Gamili Holtzeker

Learn how to properly size a water softener system for your home based on daily water use, hardness levels, and treatment needs. Use our grain capacity formula to determine the right softener size and salt tank.
Learn how to properly size a water softener system for your home based on daily water use, hardness levels, and treatment needs. Use our grain capacity formula to determine the right softener size and salt tank.

If you live in an area with hard water, installing a water softener is one of the best investments you can make for your home. Hard water contains high levels of calcium and magnesium ions that can lead to scale buildup on fixtures and appliances, reducing their lifespan. Hard water also makes it difficult to lather soap and shampoo properly. The solution is to "soften" your water by removing these mineral ions through a process called ion exchange.

But how do you know what size water softener you need? Choosing the right water softener capacity or "grain capacity" for your household is important to ensure optimal performance. Here's a step-by-step guide to help you determine the ideal water softener size for your home.

Calculate Your Daily Water Usage

The first step is to estimate your household's daily water usage, as the softener capacity will need to handle the entire volume of water used daily. Take into account all water uses including:

  • Showers, faucets, toilets - number of people in the home and average daily usage

  • Laundry - loads per week

  • Dishwasher - loads per week

  • Irrigation system (if applicable) - gallons used for watering lawn/garden

To determine gallons used, review your water bill for average daily usage. Or install a water meter on your main supply line for a week to measure actual usage.

As a general guideline, the average household uses 50-80 gallons of water per person per day.

Determine Your Water's Hardness Level

The hardness level of your water, measured in grains per gallon (gpg), determines how much calcium and magnesium needs to be removed. Hardness levels range from 1 to 50+ gpg.

To find out your water hardness:

  • Check your last water quality report from your local water company

  • Use a water hardness test kit

  • AquaLux Water Softener offers free water testing to assess hardness - click here to schedule

Higher hardness levels require a larger softener size and more frequent salt regenerations. For reference:

  • 0-3 gpg is considered soft water

  • 3-6 gpg is moderately hard

  • 6-9 gpg is hard

  • Over 9 gpg is very hard

Calculate Softener Capacity Needed

Once you know your household’s daily water use and the hardness level, you can determine the minimum grain capacity required using this formula:

Grains of hardness to be removed daily = Water used daily (gallons) x Water hardness level (gpg)

For example:

  • 4 people in the home using 300 gallons per day

  • Hardness level of 20 gpg

Daily grains to be removed: 300 gallons x 20 gpg = 6,000 grains

Therefore, this household needs a softener with at least a 6,000 grain capacity to adequately treat their entire water supply.

The AquaLux line of water softeners from Aqua-Wise Water Treatment Solutions has a range of capacities to handle any home's needs.

Larger households or those with extremely hard water may need an even higher capacity 80,000 or 100,000 grain system. Our water treatment experts can help determine the ideal softener.

Size the Salt Brine Tank

Along with grain capacity, the size of the brine tank that holds the salt pellets or crystals is another key consideration. The brine tank should be large enough to hold at least 1-2 weeks supply of salt.

As a general guideline for sizing:

  • 10,000 grain capacity softener - 250 lb salt tank

  • 20,000 grain capacity - 350 lb salt tank

  • 30,000+ grain capacity - 500+ lb salt tank

The amount of salt used per regeneration depends on:

  • Water hardness - the harder the water, the more salt needed

  • Water usage - higher water use means more frequent regenerations

For moderately hard water (10 gpg), expect to use 10-15 lbs of salt per regeneration for a 20,000 grain softener. At this rate, a 350 lb salt tank provides 1 month supply for average households before needing to refill.

Choose the Right Softener System

Once you've determined the right capacity and tank size, it's time to select the right system. Aqua-Wise offers a full range of water softeners to meet any household's needs:

  • AquaLux - Highly efficient and fully adjustable metered softeners

  • AquaSmart - Value line softeners with user-friendly controls

  • Fleck - Custom softeners built on industry-leading Fleck valves

Our water treatment specialists can help you select the ideal system based on your water quality, household size, and budget. All our systems use high capacity resin media that can remove up to 30,000 grains of hardness per lb of resin for maximum efficiency.

Professional Installation Available

Proper installation is key to ensuring your water softener performs as expected. Aqua-Wise offers full-service installation of water softeners throughout the Tampa Bay area. Our certified technicians will handle all aspects of the installation including:

  • Bypass valve setup for easy maintenance

  • Adjusting settings based on your household parameters

  • Programming the system controller

  • Ensuring correct brine draw and backwash cycles

  • Providing a full operational tutorial for homeowners

We also offer expert maintenance, parts, and service for optimal softener performance. Contact us today to learn more about our water softener installation and support services.

Soften Water for Better Living

Installing the right sized water softener provides wide-ranging benefits including:

  • Smoother, softer skin and hair

  • Cleaner laundry without detergent buildup

  • Sparkling dishes without spots

  • Scale-free fixtures and appliances

  • Safer water for drinking and cooking

  • Longer system lifespan for water heaters, pipes, and more

Remove the hardness once and for all with a properly sized water softener from Aqua-Wise Water Treatment Solutions. Schedule your free water test today to get started!

We also offer other water treatment solutions including reverse osmosis drinking water systems, whole house filters, iron & sulfur removal, and commercial treatment. Learn more at www.aqua-wise.com.

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WHAT OUR CLIENTS ARE SAYING ABOUT US

  • What is hard water?
    Answer: Hard water is water that contains high levels of dissolved minerals, primarily calcium and magnesium.
  • What are the signs of hard water in Florida?
    Answer: Signs of hard water in Florida include white or yellowish buildup on faucets and appliances, soap scum in sinks and showers, and dry, itchy skin.
  • How does a water softener work?
    Answer: A water softener works by removing the minerals that cause water hardness and replacing them with sodium ions through a process called ion exchange.
  • How often should I add salt to my water softener?
    Answer: You should add salt to your water softener tank as needed, typically every 4-6 weeks, depending on your household water usage.
  • Is softened water safe to drink?
    Answer: Yes, softened water is safe to drink. However, if you have concerns about the sodium content, you may want to consider installing a reverse osmosis drinking water system.
  • What are the benefits of using a water softener in Florida?
    Answer: Benefits of using a water softener in Florida include softer, smoother skin, cleaner dishes and clothes, longer lifespan for appliances and plumbing, and reduced buildup on fixtures and surfaces.
  • How do I know if I need a water softener in Florida?
    Answer: If you notice signs of hard water, such as buildup on fixtures or appliances, soap scum, or dry skin, you may benefit from a water softener. You can also have your water tested to determine its hardness level.
  • Can I install a water softener myself?
    Answer: While it is possible to install a water softener yourself, it is recommended that you hire a professional to ensure proper installation and performance.
  • How much does a water softener cost in Florida?
    Answer: The cost of a water softener in Florida varies depending on the size and type of system, as well as installation and maintenance costs. On average, a basic system can range from $500 to $5,000.
  • How often should I have my water softener serviced in Florida?
    Answer: You should have your water softener serviced annually to ensure it is functioning properly and to maintain optimal performance.
  • What is reverse osmosis and how does it work?
    Reverse osmosis is a water purification process that uses a semi-permeable membrane to remove contaminants from water. Water is forced through the membrane, which traps pollutants and allows clean water to pass through.
  • What types of contaminants can reverse osmosis systems remove?
    Reverse osmosis systems can remove a wide range of contaminants, including chlorine, fluoride, lead, arsenic, bacteria, viruses, and other harmful particles.
  • Do I need a reverse osmosis system if I already have a water softener?
    A water softener and a reverse osmosis system serve different purposes. While a water softener removes hard minerals like calcium and magnesium, a reverse osmosis system removes a wider range of contaminants.
  • Is reverse osmosis water safe to drink?
    Yes, reverse osmosis water is safe to drink. In fact, many people prefer the taste of reverse osmosis water over tap water due to its purity and lack of chemicals.
  • Do I need to replace the reverse osmosis membrane over time?
    Yes, the reverse osmosis membrane will need to be replaced periodically to ensure optimal performance of the system.
  • How often should I change the filters in my reverse osmosis system?
    It is recommended to change the filters in your reverse osmosis system every 6-12 months, depending on usage and water quality.
  • Can a reverse osmosis system be installed under my sink?
    Yes, most reverse osmosis systems are designed to fit under the sink for easy installation and convenience.
  • How much water does a reverse osmosis system waste?
    Reverse osmosis systems typically waste about 3-5 gallons of water for every gallon of purified water produced, but some systems are designed to be more efficient.
  • Will a reverse osmosis system remove beneficial minerals from my water?
    Yes, a reverse osmosis system will remove some beneficial minerals from your water along with the contaminants. However, these minerals can be easily replenished through a healthy diet or supplements.
  • Can I install a reverse osmosis system myself or should I hire a professional?
    While it is possible to install a reverse osmosis system yourself, it is recommended to hire a professional to ensure proper installation and optimal performance of the system.

Reviews from our amazing customers

Alexandra O

average rating is 5 out of 5, based on 150 votes, Product ratings

Tampa, FL

I recently had Aqua-Wise Water Treatment install a 96k grains water softener, carbon, and RO system in my home in Tampa. Living in an area with various contaminants, including PFAS, I was in search of a comprehensive water treatment solution, and Aqua-Wise delivered. The 96k grains water softener effectively addresses hard water issues, ensuring a noticeable improvement in water quality. The addition of a carbon filtration system enhances the removal of impurities, and the RO system provides an extra layer of purification, crucial for combating contaminants like PFAS.I can already feel the positive impact on both my appliances and overall well-being. Choosing Aqua-Wise Water Treatment has proven to be a wise decision, providing my family with clean, softened water that exceeds our expectations. I highly recommend their services to anyone in the Tampa area seeking a reliable and thorough water treatment solution.

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Mark H

average rating is 5 out of 5, based on 150 votes, Product ratings

Pinellas Park, FL

I'm delighted to share my positive experience with Aqua-Wise.com. Their installation services for our point of entry and RO system were exceptional. The team exhibited professionalism and efficiency throughout the process. Additionally, opting for their financial option at just $69 made the entire service even more accessible for my family. We're thoroughly satisfied with the results and highly recommend Aqua-Wise for their quality work and flexible payment plans.

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Julia A

average rating is 5 out of 5, based on 150 votes, Product ratings

Saint Petersburg, FL

Comments: I am so glad that I chose Aqua Wise for our water softener and RO installation. It was ultimately a decision for our health, but it's a big purchase and we wanted to make sure we were in good hands. Eyal explained everything every step of the way. You can tell he is very knowledgeable and passionate about water quality. He and his son came out quickly and the installation was seamless. We needed an electrician as well to come out and install a power supply, which Eyal also arranged for. They offer financing options as well, and they are reasonably priced in my opinion. I highly recommend Aqua Wise for your home's water needs, and supporting a local family owned business. Thank you Aqua Wise!

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