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How To Raise Calcium Hardness In Pool

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How Do I Remove Calcium Off My Pool Surface


If you spot calcium lumps or blotches in your pool, please dont alter your calcium hardness to try and fix this issue. Often, some people advise that reducing your calcium hardness will dissolve the calcium on the pool surface. This is not true. For example, maintaining the calcium level at either extreme will only make the calcium formation worse, not better. Therefore, the only way to treat calcium formation on a pool surface is to either use a calcium dissolving compound, or to drain and acid wash the pool.

If you have calcium lumps, streaks or blotches forming in your pool, please contact us for information. Remember, we can help you remove these without draining your pool water.


Why Do You Add Calcium To A Pool

Although soft water is desirable in everyday home use, calcium hardness is necessary in pool water. With sufficient levels of calcium dissolved, the aggressive nature of water is tamed and will help prevent the leaching out of certain substances in pool equipment.15 2017 .

Can Baking Soda Be Used To Clean A Pool

Maybe you have heard the rumors, and you are still in doubt about how you can clean your pool by merely adding a baking soda, then this article will help clear your doubt. To start with, let me help you understand how baking soda works. Baking soda doesnt really clean your pool per se, what it does is to maintain the PH level of the water in your pool. Maintaining the PH level of the water means keeping your pool healthy. Baking soda scrub is used for cleaning pool tiles.

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The Effects Of High And Low Hardness

Specifically, water with high calcium hardness gets cloudy unless the alkalinity and/or pH are low enough to compensate. As mentioned, the excess calcium carbonate will precipitate as crusty, grayish white scale on surfaces, piping, and equipment. It’s unsightly, can cause abrasions on users and snag bathing suits, and makes a good anchor for microorganisms. It will clog filters. When it builds up in piping, circulation is reduced and pressure increases. Scaling is an especially acute problem in heaters because calcium’s solubility is inversely proportional to temperature: As temperature increases, less calcium is able to stay dissolved. Scale on the pipes or coils acts as an insulator, slowing heat transfer. This makes it more expensive to heat the water. Over time, thick scale will cause a heater to fail.

Water with low calcium hardness will seek more by dissolving it from surfaces it comes in contact with that contain calcium, such as plaster, grout, and concrete decking. The late Dr. Neil Lowry, a well-respected instructor in our industry, preferred to call water with low calcium hardness “aggressive” rather than “corrosive” because the latter term implies the destruction of metals. The corrosiveness of unbalanced water, he would tell his students, comes from poorly maintained alkalinity and pH.

  • pitting of concrete pool surfaces
  • cloudy water
  • clogged filters and reduced circulation through piping
  • pitting of concrete pool deck
  • heater inefficiency

Raising Your Calcium Harness With Calcium Chloride:

  • First test your pool for calcium hardness. Determine how many ppm you are from the midpoint of the ideal calcium hardness range.
  • Calcium chloride is the main chemical used to increase water hardness for pools. Add this per instructions on the product label. You should be able to look up the amount to add based on your pool size and how much you want to increase your calcium hardness value, in ppm.
  • Usually the instructions say to NOT dilute the calcium chloride in water. You should instead spread the amount you are adding by getting down close to the water and spreading or pouring into the pool. Make sure you are not spreading or pouring into the wind. You also might want to only add a portion and then test before adding the remainder into the water, make sure you do not add too much and then need to lower the calcium hardness.
  • Wait at about six hours for the calcium chloride to dissolve into the water, then retest the calcium hardness level.
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    What Chemicals Adjust Alkalinity And Calcium Hardness

    For these two chemical readings there are two chemicals that we use to adjust them, and ensure your pool keeps running smooth and efficiently!

    Alkalinity utilizes sodium bicarbonate. Now you may be saying, wait a second, I use that at home! And youre correct, sodium bicarbonate is baking soda, however I would NOT recommend using the industrial strength stuff we use in the pools to bake with at home. Alkalinity will naturally dissipate, and adding muriatic acid lowers pH naturally.

    Calcium Hardness is raised by use of the chemical calcium chloride. Which may also sound familiar as it is a chemical that is commonly used to melt ice and keep walkways clear in winter! There is no way to lower calcium hardness other than expensive chemicals that are unnecessary, or by replacing portions of your pool water with fresh water.

    What Should My Pools Calcium Hardness Level Be

    Most people accept a standard level of pool hardness. Current industry standards range between 200-400 ppm in conventional swimming pools to ensure the proper chemical balance. It is generally accepted that a pH level of 100-250 is appropriate for spa pools and hot tubs. However, these volumes may differ depending on the user and what the pool is used for.

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    Magnesium Will Show As Calcium In A Water Test

    This is because the reagents that measure calcium hardness will also include the magnesium salts that are in your water. This means that your calcium hardness reading will be substantially higher, even though it may be at the right level. In short, if you have a tested calcium hardness level of 800ppm the actual calcium level will be closer to 200ppm. Also, make sure your pool shop actually knows about MagnaPool! Finally, this information is verified on the MagnaPool website which discusses this issue in greater detail.

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    How To Test Calcium Hardness In Your Pool

    How To Test and Adjust Calcium Hardness in a Pool
    • |May 6, 2022

    Calcium hardness plays an important role in your pool chemistry.

    Too low, and your water becomes aggressive as it tries to seek out calcium wherever it can. Too high, and calcium falls out of solution, scaling your surfaces and clogging up your filtration system.

    This is why were going to walk you through exactly how to test calcium hardness in a pool, step-by-step.

    Skip to:

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    What Causes Highcalcium In Pool Water

    High calcium in the water is usually the aftereffect of your pools chemical imbalance. If your waters pH, chlorine levels, and total alkalinity are messed up, calcium level rises. This is the reason why maintaining balance in your water is key. In the following section, well show you how to measure calcium hardness in a pool and make the necessary adjustments.

    What Not To Do

    Don’t just throw calcium chloride in your pool. It takes time to dissolve. Never pour calcium directly into a skimmer or gutter. That is a really bad idea and can wreak havoc on your pool equipment and filter. Calcium is an alkali earth metal and it’s harder to dissolve than some other pool chemicals. If you add calcium the proper way, you shouldn’t have problems.

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    How To Avoid Calcium Hardness Increase Or Decrease

    Did you know you can avoid the calcium hardness fluctuation in your pool? Its pretty straightforward. All you need to do is:

    • Keep your swimming pool clean by maintaining it regularly.
    • Test and balance the pool water chemistry frequently test it weekly or bi-weekly using a test kit capable of testing calcium hardness.
    • You want to make sure you keep a close eye on Total Alkalinity and calcium hardness. Address the problem as easily as possible. Avoid waiting till things get out of hard.

    Related Questions

    Can you swim in a pool with high calcium?

    No! Even though the effects of high calcium hardness are felt more by the swimming pool, they can also affect the swimmers. With the calcium levels too high, you might get irritation to the eyes and skin.

    How To Measure Calcium Hardness In Your Pool


    Test strips, such as Aquacheck 7 allows you to measure the total hardness, which includes magnesium, in your pool.

    Alternatively, you can use a drop-count titration method to get an accurate measurement of calcium hardness level.

    If you dont have a test kit, I suggest you go to the local pool store with your pool water to get it tested.

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    Why Is Calcium Chloride Essential To Your Swimming Pool

    You have heard of adding calcium chloride to your pool. You may wonder why? Calcium chloride is so essential to your swimming pool because it contributes greatly to the structural health of the pool itself. Adding calcium chloride to your pool will increase the overall calcium hardness levels in your pool. This fortification is essential. The recommended ratio is two hundred and fifty parts per million. Now that you know the importance of adding calcium chloride , you may wonder how to add it to your swimming pool.

    How To Balance Calcium Hardness In A Pool

    If you’ve ever wondered why your hands get so dry after washing them, chances are you live in a place with hard water. “But water is a liquid, how can it be hard?” That’s a great question! The terms “hard” and “soft” refer to a water’s calcium content, also known as Calcium Hardness. The higher the amount of calcium, the harder the water. And vice versa. Your swimming pool requires a certain amount of calcium to maintain an ideal water chemistry.

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    What Causes Excess Levels Of Pool Calcium

    Pool calcium can result from the following activities:

    • A pool owner adding too much Calcium Chloride or Calcium Hypochlorite to your pool.
    • The use of an acid cleaner like sodium chloride, which uses Ca as a reagent and would generate excess calcium hardness.
    • Using chlorine tablets, shock treatment or water conditioners with high levels of calcium.

    How To Lower The Calcium Hardness Levels

    How to Raise Your Calcium Hardness

    There are several ways you can take to lower the hardness level of your pool water.

  • If you know the water from your tap in your area isnt hard then you can drain part of the water in your pool and refill with fresh water.
  • If you dont have the option or option 1 then your next option is to use a flocculant to bind the excess calcium and filter it with your sand filter. It really helps when doing this to brush the walls thoroughly to lift the calcium deposits from the walls.
  • The last option is to use a dry acid to raise the saturation levels in your pool. This wont reduce your hardness but will bring your water back into balance.
  • Maintaining a properly balanced water is one of the most difficult parts of owning a pool. Calcium hardness is probably the most difficult to maintain when it get out of range. This is hindered further if you have hard water on tap. However, whist the balance can be difficult, with the right information you can overcome these problems and have a healthy safe pool.

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    How To Add Calcium Chloride To Your Pool

    • |May 4, 2021

    Many different chemicals are required to balance pool water, which keeps the water from becoming unsafe to swim in.

    One chemical pool water requires is precise levels of calcium , and this can be adjusted using calcium chloride.

    If youre unfamiliar with it, or dont know how to add calcium chloride to your pool, this article is for you.

    Skip to:

    How To Get It Juuuust Right

    Of course, the best way to avoid any calcium hardness problems is to maintain your pool, keep the water balanced, and prevent the calcium from getting too high or too low.

    • Keep your pool clean.
    • Balance the water. Keeping a close eye on your pool chemistry will help you prevent problems related to calcium hardness, and a lot of other things as well.
    • Test the water frequently. This is especially important if your water source is hard. Testing every weekevery two weeks at mostwill help you stay on top of things. Be sure to choose test strips that include calcium hardness, or get a liquid test kit.< /
    • Address problems early. Dont wait for water hardness to get out of hand before you try to fix it. As soon as you see the level creeping a little too close to the lower or upper limit of the appropriate range for your pool, take action.

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    Where Should Your Hardness Levels Be

    Calcium has the most influence on the total hardness context of your pool water. Other minerals such as magnesium, iron, manganese and a few others dont impact the total hardness enough for us to bother with so we stick with adjusting the calcium hardness. The recommended and best range is between 250 and 350 ppm for your calcium hardness.

    All of these issues are cared for by us with your weekly pool service.

    Just Adding Tap Or Tank Water Will Do The Trick Right

    ProTeam Calcium Up 25 lb Bucket Calcium Hardness Increaser for Swimming ...

    Remember, simply adding more water does not lower calcium hardness levels because as water evaporates into the air, the calcium is left behind in the pool. Remember that water evaporates but calcium does not! Therefore, the calcium stays in your pool no matter how many times it is topped up. Also, concrete pools will also release some calcium into the pool water over time, particularly when the pool surface is new.

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    Calculate How Much Calcium Chloride You Need

    Before adding the calcium hardness increaser, you want to know how much you need to raise the water hardness, and the decision is based on your pool size and volume

    A general rule of thumb if you want to raise your pool calcium hardness by 10 ppm, you will need to add two calcium chloride ounces to 1000 gallons of water.

    So, suppose your swimming pools capacity is 10,000 gallons of water, and the calcium hardness level is 20 ppm less youll need 40 calcium chloride.

    If you dont know how much water your pool hold, you can use the online calculator below:

    Effects Of High Calcium Hardness On A Pool

    High calcium content in your pool water will cause scales of minerals to build around the walls of the pool and equipment. It will also raise the pH level and cause the water to become cloudy. In some cases, high calcium hardness can clog your pools filters and stop the water from circulating, allowing more bacteria and algae to form.

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    Total Hardness Information For Balancing Your Pool

    Testing Calcium Hardness: We recommend taking a sample of your pool water to a dealer test station or using an advanced test kit.

    What is Calcium Hardness?Calcium hardness is the measure of how hard or soft your pool water is, and measures the amount of dissolved calcium and magnesium in your swimming pool. Just like pHand total alkalinity, its important to keep the calcium hardness balanced to prevent your pool water from becoming corrosive or scaling. However, before you attempt to balance your pools calcium hardness level, first make sure your pools total alkalinity level is balanced, then the pH and lastly calcium hardness. The ideal range for calcium hardness is 150-400 ppm . To determine if your swimming pool is properly balanced use our Langelier Saturation Index calculator.

    What Is The Correct Calcium Hardness Level

    How To Balance The CALCIUM HARDNESS In Your POOL | Swim University

    Heres your favorite answer: It depends. But what it depends on isnt that difficult.

    If your pool has a vinyl or fiberglass liner, the calcium hardness level should be between 175 parts per million and 225 ppm.

    If you have a concrete or plaster pool, keep the level between 200 ppm and 275 ppm.

    See? Easy.

    The key is keeping it balanced. You dont want your pool water to be too hard or too soft. Either way, youre in trouble.

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    Facts And Myths About Calcium Hardness In Water

    As with every other aspect of water chemistry, calcium hardness in water also needs to be in balance to protect your pool surface from calcium formation, stains, or corrosion. So, unlike pH and chlorine, the calcium level in most pools does not vary greatly over the seasons, so testing every few months is normally sufficient. Consequently, high or low calcium hardness can cause white staining on pool surfaces, etching, or discolouration. Remember, the trick is to maintain the calcium at the right level.

    How To Raise / Decrease Calcium Hardness

    HardTrance9 said:- Calcium chloride or calcium chloride dihydrate – Only replacing water is the way to reduce CH?

    HardTrance9 said:Is there any known commercial product that could raise CH? Something maybe that can be find at Costco? Sam’s? Home Depot? Walmart?


    chem geek said:The product Peladow is 90% calcium chloride and Dowflake is 96% calcium chloride dihydrate. These products are typically found in areas where road salt is used for ice removal, so that’s probably not Los Cabos. I find it surprising that no pool store has any Calcium Hardness Increaser. I guess they either don’t have plaster pools or don’t care very much about maintaining them.

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