You can also use this unit conversion calculator. If there is iron found in your water, you will need to correct your water hardness value. To calculate Water Softener size, first, multiply your daily household water use by your water hardness. This number is your Daily Softening Requirement. In this case, 10 GPG multiplied by gallons per day is 4, This means the softener will need to eliminate 4, grains each day. Most water softeners are designed to regenerate after a set period of time , which is usually about six or seven days.
Ideally, the softener should regenerate as-needed or once a week. If our example water softener needs to clear 4, grains of hardness each day for seven days, it will need to soften 4, GPG multiplied by seven days, or 28, grains each week. Since we are looking to clean 28, grains each week, you might assume you would simply need a tank that has at least a 28,grain capacity. Most softeners have increased salt efficiency when you lower the capacity of the tank. Consider the number of people in your household, the number of appliances in your home, how often these appliances are used, and how this affects your water consumption.
You can then use this information to calculate an average of your water use per day. Because most water softeners are designed for once-weekly regeneration, the next step is to multiply your daily water softening requirement by 7 — for the 7 days of the week.
Knowing how to size water softener is important not only for finding the right system for your needs, but also for ensuring your water softener works as efficiently as possible.
Capacity and efficiency are both big things to think about when deciding on which water softener is for you. Again, you can use the calculation above to work out roughly how many grains of water hardness you use per week, and you can then match up your softening requirements with a water softener of the best softening capacity.
According to NSF, efficient water softeners must meet minimum performance expectations for both salt and water. Efficiency is calculated by comparing the amount of hardness removed from the water with the amount of salt and water needed to regenerate the water softener.
One is using a water softener that features timed regeneration. Also, when it comes time to programming your softener it will ask for the hardness value. If you're on your own well you will have to test for hardness. If you're on city water you can usually get the hardness level from your local water utility. Their annual reports can often be found online.
When iron is present in the water, the hardness value must be corrected. For every 1. The second factor used to calculate the daily softening requirement is your household is water consumption. The most accurate way to calculate this is to look at a water bill that shows total consumption over a given period of time - usually a month.
You can use this information to figure out how much water your household uses per day, on average. If you don't have this information, simply multiply the number of people living in your home by 75 gallons per day.
This will give a fairly accurate guesstimate of daily water use. Multiply your daily water use by your water hardness corrected for iron. This number is your Daily Softening Requirement.
Here's an example:. In the example above, the softener will be removing grains per day. A softener is usually sized to regenerate about once per week. At this point you've used your local conditions and your water usage to figure out how much softening is required per day. Water softeners are usually sized so that they regenerate about once per week.
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