Water Softener Sizing and Information

Please Note:

Demand regeneration water softeners and water conditioners can generally handle 1 or 2 more people because they are more efficient as a rule. If you have more than one person in the home you should virtually always have a Demand (Metered) water softener for efficiency.

Deluxe Digital Home Water Softener
Please call 1-800-684-0979 to verify the NSF Certified manufacturer and their model of the products if you have any doubt if the equipment is NSF Certified.

Please call 1-800-684-0979 to verify the NSF Certified manufacturer and their model of the products if you have any doubt if the equipment is NSF Certified.


FIRST: Ask yourself three questions:

  1. Do I know how hard the water is? (If no, read the info below to see how to get the answer for free)
  2. Am I concerned with chlorine or chlorimines in the water? (If you were not worried about chlorine smells and such before you got to this page, you probably don't need to worry about it now. You can always run the water for 10 minutes and test the UNTREATED or UNFILTERED or UNSOFTENED water with a swimming pool or hot tub chlorine tester).
  3. Do you want to add a sediment filter in front of the softener ($49 normally), to be sure you don't have dirt or sediment building up in the water softener or salt tank?

If you think your water is harder than average, you may want to go up a size or two. The best thing to do is test it. We recommend you let someone independent (not someone who sells any type of water treatment equipment in the home) do the testing. If all else fails, you can always send us a sample and we can test it for free. Our techs will be able to help you by phone as well. You will be amazed at their knowledge. And the help is FREE! Just call the number below. Many swimming pool/hot tub type stores offer free testing. If you are on a municipal water supply (City water), you can call the number on the phone bill and ask them how hard it is. It is best to ask them for the "Range" of hardness throughout the year, as many municipal water suppliers share water or get water from different sources. Then you will use the "Highest" number they give you to size the unit, so that you never run out of soft water.


These estimates are for "Demand" or "Metered" regeneration water softeners. If you decide to buy a "Timer" model instead you may want to go up at least one size larger as "Timer" models are normally not nearly as efficient as "Demand" models.

The following guide is for people who have 0 to 10 GPG of hardness (0 to 171 PPM or MGL). For each additional 10 GPG (Or 171 PPM) you would go up at least one size. The bigger it is, the more efficient.

Families with 1-4 people:  30k grain water softener unit

Families with 4-6 people: 40k grain water softener unit

6 to 8 or more people:     60k+ grain water softener unit

For larger sizes, please click here:

Larger Model Demand Water Softeners

If you are not sure what size you need, just give a friendly water tech a call at 800-684-0979 for assistance. They do not work on commission and are not allowed to ask you to buy anything  or pressure you in any fashion. Don't worry, we are the nice company who just tries to help you. Even if you never buy a thing.

Please Note: For homes with an automatic dishwasher, count the dishwasher as 1/2 person when sizing your home water softener. For homes with an automatic clothes washer, count the clothes washer as 1/2 person when sizing your home water softener.

If you have hardness measurements listed in mg/l or ppm, that is the same thing. If they are given to you in a measurement called GPG or grains per gallon, that is a different measurement. 

ppm or mg/l ÷ 17.1 = GPG (Grains per gallon)

GPG x 17.1 = ppm or mg/l

The information above that tells you what size you need for the amount of people in your home is using an average hardness of 1-10 GPG (17 to 171 PPM).  Once you get over 10 you should go up a size of water softener. Once you get over 20 you should go up another size and so on so that you know the unit will be efficient and not use too much salt and water to clean itself. When in doubt, go up a size. It will virtually always mean more efficiency. If you are unsure at all about sizing a water softener for your home or business, simply give one of our techs a quick call for some friendly and helpful advice. Don't worry, our techs don't work on sales commission and are not allowed to ask you to buy anything. They just give you great advice! There is NEVER any pressure at WaterFiltersOfAmerica.com.

Water testing:

If you do not know how hard your water is, you should find out before making a purchase from anyone. You certainly should get this right the first time so that you will have many great years of efficient service from your new water treatment appliance. If you are on a "City" or "Municipal" public water supply simply call the water company that provides your water and ask them. They will tell you. Never have in home sales companies come to your home for a so called "Free" water test. They will actually be coming with a strong and relentless sales pitch as well. Any municipal water provider will tell you right over the phone. If for some reason they can't or won't tell you, you can always send us a sample for free. Just give us a quick call at 800-684-0979 and ask them where to send the sample.

If you are on a "Private" well water supply; including spring water and cistern water supplies that bring water into the home you may need to have someone test the water. A couple of FREE ways to get this done without the hassle of salespeople and sales pitches is to simply send us a sample for free testing; or in many areas swimming pool and hot tub supply stores will test for free. If there was a chance you would ever buy a pool or hot tub they understand you need to know what the water is like. They will generally do it for free and give you a print out of the results. Once you have those results simply call one of our techs for advice. We also have online chat and e-mail advice if you prefer. If you decide you would like us to test for free just give us a quick call or e-mail or click on the "Live chat" button and we will tell you how to mail us a sample for testing.

Water Softener Warnings:

Remember you should NEVER use a water softener as an iron filter. That is a very common scam in this industry to get you to pay for expensive service calls in the future and to raise your salt usage as most in home sales companies sell salt and service calls. If you have a private well with iron in the water you should read our iron filter page. They use NO SALT at all and are virtually maintenance free. They are also chemical free. The best ones are called "Terminox™".

Don't drink the water from ANY softener:

You should not drink the water from ANY water softener as a rule and should be wary of any sales people who say you can. There are links on our water softener page that explain why in detail. There are also links on that page explaining why you should NEVER use a water softener as an iron removal filter.

If you want to drink the water that comes from a water softener, you can add a filter in the kitchen called reverse osmosis (4 stage model $199.87). It will make the water sodium free and remove virtually all other unwanted contaminants from your drinking water. If you know you have high chlorine going into the reverse osmosis unit, then you would want the 5 stage model ($219.87). You can find both at the top of this page:

Reverse Osmosis Drinking Water Systems | Water Filters of America™.com