Water softener hardness level chart

after the water softener. • Allow your water softener or drain line to freeze. • The salt level should always be at least 1/3 full. Refill salt when the level drops below the water level in the brine cabinet. A resin cleaner can be used on a monthly basis. Clean white pellet, cube-style, or solar salt is recommended. Do not use rock salt.

Water softener hardness level chart. Let's filter through the technicals to see why this name is worth watching for thirsty investors....XYL Xylem (XYL) provides a wide array offerings for the water industry, incl...

To set the hardness setting on the Morton water softener, follow this procedure. First, determine what the harness setting should be. Multiply the iron concentration (ppm) by 5. Add this number to the hardness. If your iron is 2 ppm and the hardness is 8 gpg, your adjusted hardness is (2 x 5) + 8 = 18 gpg.

Nov 17, 2023 · This Water Softener Hardness Scale tells us if the water is soft or hard on a scale based on how many minerals are found in it. This water softener hardness chart will be based on grains per gallon (GPG) and Parts Per Million (PPM) and will look like this: Here’s how you can calculate the required grain capacity. Multiply your softening requirement of 8300 grains by a week, and you’ll get the total softening capacity. 8300 of hardness grains every day × 7 days = 58100 grains (per week) 5. Taking Salt Efficiency into Account.If you set the hardness higher than it needs to be, your unit will still give you the same degree of softness (0-3 gpg), but it will use more salt and water because it will perform more recharges. This isn't ideal. Setting the hardness number higher than necessary reduces the efficiency of your softener. In short, the answer is No.A water softener sizing chart is a tool that helps you determine the appropriate size of a water softener for your specific needs. The size of a water softener is crucial because it needs to handle the water hardness and usage demands of your household or business to effectively remove calcium and magnesium ions from the water. Here’s a general guide on how to understand and use a water ...Some cities, including San Angelo, Kyle, and Round Rock display significantly high water hardness levels, reaching up to 472 ppm, 27.57 gpg. On the other end of the spectrum, cities like College Station and Bryan boast exceptionally low water hardness figures, downwards of 6.0 ppm, 0.35 gpg.If you live in an area with hard water, you may have experienced the negative effects it can have on your home and appliances. Hard water contains high levels of minerals like calc...What is a Good Hardness Level for Water? Determining the ideal hardness level for water involves striking a balance between reaping the benefits of softened water and avoiding unnecessary strain on the water softening system. The unit of measurement commonly used for water hardness is grains per gallon (gpg).

Calculation for Sizing a Water Softener. Multiply the number of people in your family times 70 (gallons of water used per day, national average). Multiply the answer by your water hardness in grains per gallon (to convert mg/l or ppm to grains, divide by 17.1). If iron is present, add 5 grains for every ppm (mg/l) of iron (iron MUST be ...Here’s how you can calculate the water softener capacity using this method: Determine the hardness level of your water in grains per gallon (GPG). Estimate your average daily water usage in gallons. Multiply the hardness level (in GPG) by the daily water usage to get the total grains of hardness to be removed per day.If you need to convert hardness from ppm to Grains per gallon (GPG) divide the total water hardness by 17.1. Example: 200ppm of total hardness / 17.1 = 11.69 GPG. 4 Adjust for Iron. If iron is present in your water supply please add 5 grains of hardness for every 1 ppm of iron and determine your size water softener from there.4 persons x 90 gallons/person = 360 gallons (per day) 3. Calculating Your Daily Softening Requirement. Lastly, multiply your hardness level by your daily water usage. The result is your daily softening requirement, so how many hardness grains a softener has to remove from your water on a daily basis. Multiply grains per gallon GPG by 17.1 to get hardness in PPM: GPG x 17.1 = PPM. Set the water softener "Capacity": Adjust the water softener capacity setting according to your manual and our example discussed earlier. Typically capacity for a water softener is a number from 1 to 99 kilograins.

Water softeners are essential devices for homeowners who want to improve the quality of their water supply. Hard water can cause various issues, such as limescale buildup, reduced ...Check the salt level a few weeks after you install the softener and every week after that. Add when the brine tank is from 1/3 to 1/2 full. Never allow the softener to use all the salt before you add more. Without salt, you will soon have hard water. Use clean water softener salts only, at least 99.5% pure.5 days ago · Your water softener hardness setting should ideally be set to the amount of hardness in your water plus 4 for every ppm of dissolved iron in the water. For instance, if you have 1 PPM of iron, you must add 4 to the hardness number, and if you have 1.5 PPM of iron, you must add 6 to your hardness number, and so on. Fill 10mL of water from the softener into a plastic bottle. Add one Yes/No test tablet into the water and shake vigorously until the color changes. The hardness level is below 20mg/L if the color is green, indicating soft water. If it is red, then the hardness level is above 20ppm. . If you set the hardness higher than it needs to be, your unit will still give you the same degree of softness (0-3 gpg), but it will use more salt and water because it will perform more recharges. This isn't ideal. Setting the hardness number higher than necessary reduces the efficiency of your softener. In short, the answer is No. Welcome to the world of water softener hardness setting—a realm where science, technology, and a touch of alchemy converge to bring the joys of silky water into …

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1. 1-2 people: minimum 30,000 grain capacity water softener. 2. 3-4 people: 30,000-40,000 grain capacity water softener. 3. 4-6 people: 40,000-60,000 grain capacity water softener. These sizing rules have been born out over the years with thousands of water softeners installed and working fine.Hardness water hard level chart ppm grains gpg too family gallon perWater softener find solution chart system type softening choose ready re now The ultimate guide to water qualityThe water softener blog: may 2016. ... Water softener chart hardness salt model comparison culligan flow materials buildingWater softener chart size sizing tank ...To work out the size of a water softener for your home, use the following three-step calculation: Step 1: Number of people in your home x 70 1 = N. Step 2: N x your water hardness (measured in GPG 2) = grains per day (GPD) number. Step 3: Multiply the GPD number by 7 (the number of days in the week). You can compare this number to …The best hardness setting for a water softener is 10 grains per gallon. This setting will provide you with the most effective protection against hard water problems. … Water Softener - Determining Your Water Hardness. Water hardness is determined by the grains per gallon (gpg) in your water. You can get grains per gallon of your water from a water analysis laboratory. If you are on a municipal city water supply, call you local water department for the water hardness. You can also contact an independent water ...

Montana water is considered slightly hard with an average state range of 91 PPM. The hardest water in the state comes from Kalispell, with a water hardness level of 175 PPM. For reference, water is considered hard between 120-180 PPM. 180 and above is considered very hard according to USGS water hardness measures. Adjust the “hardness” setting on your water softener to the number that you measured from your water supply. If for example, the measured water hardness was 30 GPG (30 grains per gallon), then set your “hardness” setting to 30. If you used the PPM measurement, divide the PPM by 17.1 to get a GPG reading. PPM/17.1 = GPG. Here’s a rough estimation of salt dosage based on water hardness: 0-3 GPG: No salt dosage required. 3-7 GPG: 1/4 to 1/2 cup of salt per regeneration. 7-10 GPG: 1/2 to 3/4 cup of salt per regeneration. 10-15 GPG: 3/4 to 1 cup of salt per regeneration. 15-20 GPG: 1 to 1.5 cups of salt per regeneration.Adjusting Your Water Hardness Level. Now that you understand your water’s hardness level, it’s time to explore options for adjusting it to achieve the ideal …The article provides both a table and a calculation method to determine how much salt is needed for a given level of water hardness. This article also explains how to repair or adjust the brine tank float - a device that determines the quantity of salty brine to be produced for use during water softener regeneration. Here is the most common scale used to determine the dissolved mineral content of your water supply: Water is considered soft if it contains less than 1 GPG of dissolved minerals. Water is considered moderately hard if it contains between 1 – 7 GPG of dissolved minerals. Water is considered hard if it contains between 7 – 10 GPG of dissolved ... Here, you see that you need anywhere from 4,000-grain to 40,000-grain water softener capacities. 2nd chart is for households with “Hard” water (7.5 to 10.5 GPG water hardness). For hard water, you will need anywhere from 10,000-grain to 60,000-grain water softener. 3rd chart is for households with “Very Hard” water (12 GPG and more).Learn how to create an HTML code for a Water Softener Hardness Calculator using Concentration (ppm), Volume (gallons), and Hardness (gpg). Follow step-by-step instructions, a formula (H=(C∗V)/17.1), and practical examples to build a functional calculator for your water softening needs.TOTAL PERMANENT HARDNESS = CALCIUM HARDNESS + MAGNESIUM HARDNESS. Based on the molar mass of calcium and magnesium, hardness is calculated with this equation: Hardness = 2.497 (Ca) + 4.118 (Mg) You can see from this equation that hardness is most strongly affected by fluctuations in magnesium than calcium.Nov 17, 2023 · This Water Softener Hardness Scale tells us if the water is soft or hard on a scale based on how many minerals are found in it. This water softener hardness chart will be based on grains per gallon (GPG) and Parts Per Million (PPM) and will look like this: Feb 19, 2024 · Water softening softener capacity testing test softeners residentialClearwave water softeners (deep guide) 2022 review Water hardness levels softener muchWater softener: water softener hardness chart.

The hardness of water, expressed in mg/l CaCO 3 (calcium carbonate), can be classified as shown below: Table 1 Hardness of Water. Water Hardness (mg/l CaCO 3) Soft. up to 100. Slightly hard. 100 -150. Moderately hard. 150 – 200.

Below we have covered all six of the compact water softeners found in the chart above with in-depth review information so you can make your best choice. 1. Springwell Futuresoft (Best Compact Water Softener) ... As a rule, a home with a lower hardness level in its water will use less salt than a home that has a high amount of hard … Here’s a rough estimation of salt dosage based on water hardness: 0-3 GPG: No salt dosage required. 3-7 GPG: 1/4 to 1/2 cup of salt per regeneration. 7-10 GPG: 1/2 to 3/4 cup of salt per regeneration. 10-15 GPG: 3/4 to 1 cup of salt per regeneration. 15-20 GPG: 1 to 1.5 cups of salt per regeneration. Hardness Level 0 - 50 0 – 3.5 Soft 51 - 100 3.6 – 7.0 Moderately soft 101 - 150 7.1 – 10.5 Slightly hard 151 - 200 10.6 – 14.0 Moderately hard 201 - 300 14. 1 – 21 Hard ... limited. However, if a water softener is installed for this reason, the authorities still recommend that a drinking water tap that is not softened is retained ...Total Water Hardness =[CaCO 3] = 2.5 * 24 mg/L + 4.1 * 28 mg/L = 174.80 mg/L The result is the total hardness of water: 174.80 mg/L or 174.80 ppm. If you have such a high water hardness, you might want to consider using a salt-free water softener to reduce the water hardness below 60 ppm. If you have any questions about the water hardness ...Jul 29, 2021 · Water softener is needed when your water hardness is more than 300+ PPM or 15+ GPG. It means your water is much harder and makes trouble for home appliances and will use lots of detergent as well. Most people face skin and hair fall issues if the hardness levels are higher and you are not using water softener to soften your water. The following chart explains how you might set your water softener based on your water hardness, the iron content of your water, and the age of your water …Jul 29, 2021 · Water softener is needed when your water hardness is more than 300+ PPM or 15+ GPG. It means your water is much harder and makes trouble for home appliances and will use lots of detergent as well. Most people face skin and hair fall issues if the hardness levels are higher and you are not using water softener to soften your water. Your water softener hardness level is based on the concentration of calcium carbonate in your water supply. ... Now that you have your water hardness value you might be wondering whether you need a water softener, using the water hardness chart and table below you can see whether your water is considered hard or not. gpg ppm or mg/L; …If you have hard water, you’ll see some obvious signs in and around your home. Although a water softener is an investment, if you have hard water, it’s usually a worthwhile expendi...

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At 0-3 gpg, you don’t need water softening at all. 3-7 gpg: Moderately Hard Water. When the gpg exceeds 3 gpg up to 7 gpg the water is categorized as moderately hard water. In your home, this would be noticed as patches of dry skin after washing, bathing, and showering. Find out what your water softener’s hardness setting should be by reading about it. What if Water Softener Hardness level set to Low . You will be unable to get the most efficient performance from your water softener if the settings you enter are inaccurate. If you set the hardness level too low, your water softener will not be able to ... For example, you can: Step 1. Use a water softener: This is a device that will remove the minerals from your water, making it softer. Step 2. Install a reverse osmosis system: This is a filtration system that efficiently eliminates contaminants and reduces impurities in your water, resulting in better overall health for your family. Step 3. Adjusting Your Water Hardness Level. Now that you understand your water’s hardness level, it’s time to explore options for adjusting it to achieve the ideal …Water Softener - Determining Your Water Hardness. Water hardness is determined by the grains per gallon (gpg) in your water. You can get grains per gallon of your water from a water analysis laboratory. If you are on a municipal city water supply, call you local water department for the water hardness. You can also contact an independent water ... The hardest water in the state comes from Kalispell, with a water hardness level of 175 PPM. For reference, water is considered hard between 120-180 PPM. 180 and above is considered very hard according to USGS water hardness measures. While many Montana cities have hard water, such as Missoula (175 PPM) and Great Falls (147 PPM), there are a ... What does the grain capacity of a water softener mean? The rated capacity of a softener is the maximum number of grains of water hardness the unit can remove prior to regeneration. How is the hardness of water measured? The hardness of water is measured in grains per gallon (gpg). One grain of hardness is equal to 1/7,000 pound of rock.The first thing you need to know is the exact hardness level of your water; otherwise, you cannot choose the right size water softener. ... One large family might require 15 gpm water flow rate. Water Softener Sizing Chart. gpg 1-2 People 3-4 People 5-6 People 7-8 People; 5-10: 24000: 24000: 40000: 48000: 10-20: 24000: 48000: 64000: …Both of these units of measurement have the same scale when it comes to water hardness. Water has 5 levels of hardness, namely: Soft; Slightly Hard; Moderately …The standard measurement used for water hardness in the U.S. is measured in “grains per gallon” (GPG). The term “grains” in this context refers to a specific unit of weight, which is equivalent to 1/7000th of a pound. Therefore, when we say “grains per gallon,” we are referring to the number of grains of hardness minerals contained ...Water softener hardness chart. According to the United States Geological Survey, water hardness is classified in 4 types. You can follow the water hardness scale conversion table-. Classification. hardness in mg-CaCo3/L. Hardness in mmol/L. Hardness in DGH/ ° dh. Hardness in gpg. Hardness in ppm. ….

If you have hard water, you’ll see some obvious signs in and around your home. Although a water softener is an investment, if you have hard water, it’s usually a worthwhile expendi...Quick Answer. A water softener should regenerate every 2-5 days and at least once every 14 days. If it’s regenerating every night, your softener may be too small. The optimal regeneration frequency for modern water softeners is calculated based on hardness levels, water usage, and softener capacity.Grains per Gallon. According to the Water Quality Association, the hardness scale, measured in gpg of calcium carbonate, can be represented as follows: Less than 1 gpg is considered soft. Between 1 and 3.5 gpg is considered slightly hard. Between 3.5 and 7 gpg is considered moderately hard. Between 7 and 10.5 gpg is considered hard.Press the Program button to move forward to the 'Set Salt' screen. If that does not come up for you, follow next step. NaCl (Sodium Chloride) is the most common type of water softening salt. If you have sodium dietary restrictions, KCl (Potassium Chloride) is a good alternative option. Make sure to change the salt type if you use this alternative.Hardness Level 0 - 50 0 – 3.5 Soft 51 - 100 3.6 – 7.0 Moderately soft 101 - 150 7.1 – 10.5 Slightly hard 151 - 200 10.6 – 14.0 Moderately hard 201 - 300 14. 1 – 21 Hard ... limited. However, if a water softener is installed for this reason, the authorities still recommend that a drinking water tap that is not softened is retained ... The standard measurement used for water hardness in the U.S. is measured in “grains per gallon” (GPG). The term “grains” in this context refers to a specific unit of weight, which is equivalent to 1/7000th of a pound. Therefore, when we say “grains per gallon,” we are referring to the number of grains of hardness minerals contained ... Hardness is generally measured in grains per gallon (gpg). Although the hardness scale only lists water up to 10+ grains per gallon of hardness, there are homes that have water in excess of 100 grains of hardness. Although there are homes with naturally soft water, many homes need to mechanically soften water to achieve a hardness level of less ...4 persons x 90 gallons/person = 360 gallons (per day) 3. Calculating Your Daily Softening Requirement. Lastly, multiply your hardness level by your daily water usage. The result is your daily …Water softener is needed when your water hardness is more than 300+ PPM or 15+ GPG. It means your water is much harder and makes trouble for home appliances and will use lots of detergent as well. Most people face skin and hair fall issues if the hardness levels are higher and you are not using water softener to soften your water.Grains per Gallon. According to the Water Quality Association, the hardness scale, measured in gpg of calcium carbonate, can be represented as follows: Less than 1 gpg is considered soft. Between 1 and 3.5 gpg is considered slightly hard. Between 3.5 and 7 gpg is considered moderately hard. Between 7 and 10.5 gpg is considered hard. Water softener hardness level chart, Feb 1, 2024 · 1. 1-2 people: minimum 30,000 grain capacity water softener. 2. 3-4 people: 30,000-40,000 grain capacity water softener. 3. 4-6 people: 40,000-60,000 grain capacity water softener. These sizing rules have been born out over the years with thousands of water softeners installed and working fine. , Top 5 Water Softeners. Best Magnetic Softener: YARNA Capacitive Electronic System. Best Hybrid Softener: Whirlpool WHESFC Pro Series. Best for Large Households: AFWFilters Iron Pro 2. Best Shower Filter: MEETYOO 15-Stage Water Softener. Best Value: iSpring ED2000 System. , At left is a typical water softener recharge frequency chart for a Culligan System 19 or 23 Water ... My water softener hardness was set at 197 I have city water hardness 6 I dont want it ... Thanks to reader M.P. for discussing the requirement to adjust the float level in water softener brine tanks - January 2011 [15] Kinetico Model 50 ..., An efficiency rated water softener is a DIR softener which also complies with specific performance specifications intended to minimize the amount of regenerant brine and water used in its operation. These softeners shall have a rated salt efficiency of not less than 3350 grains of total hardness exchanged per pound (477 grams per kilogram) of ..., This is important because your unit uses the hardness setting to determine how often it needs to recharge. If you set the hardness higher than it needs to be, your unit will still give you the same degree of softness (0-3 gpg), but it will use more salt and water because it will perform more recharges. This isn't ideal., 1. 1-2 people: minimum 30,000 grain capacity water softener. 2. 3-4 people: 30,000-40,000 grain capacity water softener. 3. 4-6 people: 40,000-60,000 grain capacity water softener. These sizing rules have been born out over the years with thousands of water softeners installed and working fine., Set the Water Hardness. Next, you'll press the Program button to move forward to the 'Set Hardness' screen. The hardness of your incoming water depends on your geographical location, so there's not an 'average' or 'normal' number for this setting. You need to figure out your hardness number. To calculate your specific number, use our Hardness ..., Here is the most common scale used to determine the dissolved mineral content of your water supply: Water is considered soft if it contains less than 1 GPG of dissolved minerals. Water is considered moderately hard if it contains between 1 – 7 GPG of dissolved minerals. Water is considered hard if it contains between 7 – 10 GPG of dissolved ... , Water softeners are essential devices for homeowners who want to improve the quality of their water supply. Hard water can cause various issues, such as limescale buildup, reduced ..., The hardness level dial, often labeled as “hardness setting” or “grains per gallon,” allows you to set the softener to the appropriate level based on your water’s hardness. Follow these steps to adjust the hardness level: Locate the hardness level dial on your water softener control valve. Refer to your water hardness test results in GPG., Here’s a rough estimation of salt dosage based on water hardness: 0-3 GPG: No salt dosage required. 3-7 GPG: 1/4 to 1/2 cup of salt per regeneration. 7-10 GPG: 1/2 to 3/4 cup of salt per regeneration. 10-15 GPG: 3/4 to 1 cup of salt per regeneration. 15-20 GPG: 1 to 1.5 cups of salt per regeneration., Once you have determined the hardness level of your water, you can adjust the settings of your water softener to match. Common mistakes when adjusting the hardness setting include setting it too low or too high, failing to account for iron concentration, and not adjusting for changes in water hardness over time., Knowing your right water softener's hardness level is crucial in selecting the right-sized softener. Converting PPM Hardness to Grains. As mentioned, if you have a water test result in ppm hardness scale and need to make sense of it in terms of grains, use the ratio of 1 GPG = 17.1 ppm., The hardness level dial, often labeled as “hardness setting” or “grains per gallon,” allows you to set the softener to the appropriate level based on your water’s hardness. Follow these steps to adjust the hardness level: Locate the hardness level dial on your water softener control valve. Refer to your water hardness test results in GPG., The first thing you need to know is the exact hardness level of your water; otherwise, you cannot choose the right size water ... One large family might require 15 gpm water flow rate. Water Softener Sizing Chart. gpg 1-2 People 3-4 People 5-6 People 7-8 People; 5-10: 24000: 24000: 40000: 48000: 10-20: 24000: 48000: 64000: 80000: 20 ..., Hard Water & Water Softening Systems FAQ. Expand All. Learn more about Whirlpool ® Water Softeners through these Frequently Asked Questions. If you have further questions, call 1-866-986-3223 or email us at [email protected]., HOW HARD IS YOUR WATER? The degrees of water hardness are described in the chart below. If you’d like to see where your water system’s water falls, check out our water quality fact sheet located online at newjerseyamwater.com. Under Water Quality, select Water Quality Reports and view the water quality summary for your water system. Degree of, A. O. Smith water softeners are packed with fine mesh resin beads, that your hard water flows through, and—in a process called ion exchange—trades places with sodium ions, removing the hardness. When you have hard water, we’ve got you covered. Save time and money with the self-cleaning pre-filter. As your water softener runs, the pre ..., From 0 – 60 milligrams per liter (0 – 3.5 GPG), the USGS considers water soft. According to this measurement, 61 to 120 milligrams per liter (3.5 – 7 GPG) is moderately hard water, 121 to 180 milligrams per liter (7 – 10.5 GPG) is hard water, and 181 milligrams per liter and above (10.5 GPG +) is very hard water., The table below gives an idea of how you might set your water softener based on your water hardness, your iron content, and the age of your water softener. Water Hardness (GPG) Iron (PPM), What is a Water Softener Hardness Chart? A water softener hardness chart is a visual representation of the different levels of hardness found in water. It typically …, Once you've got your levels of hardness and clear water iron you can calculate hardness. The softener communicates in GPG (Grains per gallon). If your hardness number is not in GPG you'll need to do a little math. Don't worry, the numbers you need are below. If your hardness number reported in PPM or MG/L, divide that number by 17.1 to convert ..., The easiest way to determine the water softening frequency is to multiply the level of water hardness by your usage per day and this will result in the actual amount of softening that needs to be done for daily use. Here is a clear example of how its done: So, for instance, the hardness is 10 GPG and a family of four people uses approximately ..., • This system may be applied on municipality or well water systems. On hardness levels of 60 grains and higher, the system may not achieve a hardness of less than 1 grain, due to high Total Dissolved Solids (some bleed through is possible). Bleed through can also be caused by sodium levels higher than 1000 ppm., 90,000-Grain. 100,000-Grain. We can see that a family of 4 needs anywhere from a mere 8,000-grain to 100,000-grain water softener. This is quite a big range; of course, the precise grain capacity depends on monthly water usage and water hardness. Most 4-member household will need a 24,000-grain, 36,000-grain, and 44,000-grain units., Sep 25, 2566 BE ... 121-180 ppm: Moderately Hard – Water begins to show moderate hardness, and there may be some scale buildup over time. 181-250 ppm: Hard – Water ..., Learn how to create an HTML code for a Water Softener Hardness Calculator using Concentration (ppm), Volume (gallons), and Hardness (gpg). Follow step-by-step instructions, a formula (H=(C∗V)/17.1), and practical examples to build a functional calculator for your water softening needs., A softening Chinese economy could be a headwind even if Evergrande is bailed out. However, deals can be found among companies with little or no China exposure....PINS Just maybe, t..., Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects., Mar 14, 2555 BE ... Water hardness after a softener should always be 0 gpg no matter the initial hardness. When the tech adjusted the setting for brine tank refill ..., Water softening softener capacity testing test softeners residentialClearwave water softeners (deep guide) 2022 review Water hardness levels softener muchWater softener: water softener hardness chart., Some cities, including San Angelo, Kyle, and Round Rock display significantly high water hardness levels, reaching up to 472 ppm, 27.57 gpg. On the other end of the spectrum, cities like College Station and Bryan boast exceptionally low water hardness figures, downwards of 6.0 ppm, 0.35 gpg., Water softener hardness chart. According to the United States Geological Survey, water hardness is classified in 4 types. You can follow the water hardness scale conversion table-. Classification. hardness in mg-CaCo3/L. Hardness in mmol/L. Hardness in DGH/ ° dh. Hardness in gpg. Hardness in ppm.