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How To Raise Hardness In Pool

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Remove Calcium From Water


Here is one of the biggest myths about calcium hardness. Some people believe that topping up you pool with fresh tap or tank water will reduce the calcium level over time. This is not true. Remember, adding water does not lower calcium hardness because as water evaporates, the calcium is left behind in the pool. Importantly, water evaporates but calcium does not! This means that all calcium stays in your pool no matter how many times it is topped up. Also, concrete pool surfaces will also release some calcium into the pool water over time, particularly when the pool surface is new.

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.

The Most Significant Advantage Of Both Baking Soda And Soda Ash

Soda ash has a very high PH level of 11.4, thus making it ideal for increasing the acidity of water, without having much effect on alkalinity.

However, baking soda which has a PH level of 8.3, and can also be used for adjusting the PH level of a pool, but will have more impact on the alkalinity level as we saw in the example mentioned above. Overall, baking soda is ideal for adjusting the alkalinity of a pool, than it is for improving the PH level-even though it can also be used to an extent. Whereas soda ash is best at adjusting the PH level without impacting much on the overall alkalinity of the pool, as only a small quantity of it would be required to raise the acidity level of a pool.

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Attention When Using Baking Soda And Epsom Salt


Just like every other method, you can apply bakingsoda and Epsom salt to increase the hardness of your water.

Baking soda contains sodium bicarbonate. One thingabout it is that the more the baking soda in your water, the higher thecarbonate hardness.

Of course, the effect is usually a high pH and morebuffers.

Whats more? Epsom salt contains magnesium sulfate.The overall effect of Epsom salt in your water is that the more the Epsom saltin your water, the higher the magnesium.


You may not know. It is not advisable to subscribeto the idea of using baking soda and Epsom salt to increase the hardness ofyour aquarium water.

This is because baking soda contains a voraciousamount of sodium which is harmful to your fish.

On the other hand, Epsom salt contains zero calciumwhich is not good.

Most hard waters have an equal amount of calcium andmagnesium.

Calcium Hardness In Pools

How to Raise Calcium Hardness in a Swimming Pool

The main reason that your concrete swimming pool may have a high calcium hardness is because of the concrete surface. In this case, a concrete surface will release calcium hydroxide into your pool water. However, this increase in calcium is reduced when water is removed from your pool. For example, splashing out water when swimming, or back washing the filter all remove water from your pool. Because of this, most pools do not suffer from increasing calcium levels over time.

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What If My Calcium Hardness Is Too Low Isnt That Good

The only way to properly lower your calcium hardness level is to pump out a small amount of existing pool water and then refilling. This lowers the level because calcium rich water is pumped out of the pool and then replaced with tap water with very low calcium levels. Depending on where you live, most tap water in Australia has a calcium hardness of around 50ppm while tank and rainwater contain no calcium at all. So, following this drain and refill process will lower the calcium level without chemicals! Remember, if you live in a region that is known for hard calcium or mineral rich water, then have the calcium level of your tap water measured before starting this process. Importantly, you dont have to drain the entire pool to lower the calcium level. In many cases, replacing as little as 30-40 cms of water will bring your pool back into the normal calcium range.

How To Use Baking Soda To Spot

It is common to find some form of black or brown spots around the pool sometimes. These black and brown spots are a result of algae. However, there is no need for you to panic as I will show you how to spot-treat algae problems in a pool.

Step 1: Visit your grocery store, purchase any algae killing product, and proceed to add it into your pool by following the manufacturers instructions written on the labeling.

Step 2: Allow the algae to kill the product to circulate. Again, the time taken for this product to distribute is dependent on the size of your pool. However, it may take anywhere between 6 and 10 hours.

Step 3: After proper circulation of the algae killing product, sprinkle your baking soda, allowing it to have direct contact with the problem area.

Step 4: Now, scrub the affected area using a pool brush and watch how the algae disappear.

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What Is The Correct Calcium Hardness Level

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.

Magnesium Will Show As Calcium In A Water Test

How to Raise Your Calcium Hardness

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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What Is The Ideal Calcium Hardness Level

At Orenda, we hear this question all the time. Here’s our answer to everyone: the ideal calcium hardness level is one that allows you to comfortably maintain LSI balance year-round.

The colder your climate, the more calcium hardness you should have in the water. We differ from many textbooks on this, and we do so based on our own learning of the LSI and in-the-field evidence. We suggest 300 ppm calcium hardness as a minimum, even if you’re in a hot climate. If you are in a climate where your pool can freeze, 400 ppm is the bare minimum for you…though it’s even better if you have 450-500 ppm. As a matter of fact, many commercial pools that use calcium hypochlorite chlorine routinely maintain calcium levels over 700 ppm without scale problems. Scale is not a function of calcium hardness alone, but of calcium carbonate saturation, as measured on the LSI.

Too much calcium can be a bad thing, and cause scale. Scale is annoying, but guess what? It doesn’t damage the pool. Scale is treatable the opposite problem of being under-saturated with calcium is not. Add calcium to get the water happily saturated with it, and etching/corrosion problems can be prevented.

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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Test Your Water Regularly

Ideally, you should be testing your pool water every week, especially if your water source is hard. You should also check the calcium hardness every time you drain the pool and add new water or chemicals. If youve had torrential rain recently, its also a good idea to test. The best test kits are usually liquid kits, but test strips work too. Just make sure your test kit includes a test for calcium hardness.

How To Lower Hardness In A Pool

How to Raise Calcium Hardness in a Swimming Pool

If youre dealing with too much calcium in a pool, you can try adding a sequestering agent, which is a chemical treatment that fights the effects of high metal and calcium content in swimming pool water . If you routinely struggle with high calcium levels or if you live in a place where hard water is an issue, you should make a sequestering agent part of your regular chemical maintenance program.

Of course, when dealing with any swimming pool issue from calcium problems to questions about routine maintenance — your local pool professional is a great resource. They can prescribe what is best for your pool to take care of and prevent any problem that can arise.

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How Do You Add Calcium To An Inground Pool

Add calcium in four easy steps. 1 Check the hardness of the pool water and fill it with water. 2 Submerge the bucket in the pool until it is about 3/4 full with water. 3 Stir until the calcium chloride is completely dissolved. 4 Slowly pour the completely dissolved calcium chloride into a container.

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Find Your Balance: Managing Calcium Hardness

Dont worry, were not doing yoga today.

No matter which situation youve found yourself in after testing your pool water, the best way to fix the problem is with proper balance. Balancing your pool water starts with the classic steps of pool maintenance.

  • Clean: Start by thoroughly cleaning your pool. This means turning on the filter and vacuum, emptying the skimmer basket, and grabbing your skimmer net and pole to pick up anything floating on top. A good deep-clean is a great way to get your pool back into balance.
  • Test: Next, do a routine pool water test to check your chemistry. Be sure to pay close attention to the pH and total alkalinity. If these are out-of-whack, theres no chance of fixing any calcium hardness issues you may have.
  • Balance: Lastly, balance your pool water with the information you got from the test. If your levels were in-range, perfect! Youre good to move on to adjusting the calcium hardness levels.
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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:

    High Calcium Hardness Damages Pools

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

    It is important that your calcium levels are maintained correctly. If the calcium levels in your pool water are too high for a long period it will cause calcium to form on your pool surface. This is why water testing is often known as balancing the pool water. Remember, it is not about taking levels to the opposite extreme. Just keep your water in balance. Remember the surface can be damaged if your calcium levels are to low or too high.

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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.

    How Long To Run Pool After Adding Calcium Powder

    Lime hardness. You can swim for 2 hours after adding it, but plan a full water change if possible. Refreshing is the complete filtration of all the water in the pool, usually around 10am.

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    What Is Calcium Hardness

    Youve heard of hard water, right? You may live in an area where the municipal water is hard. Or you may even get your water from a well. Either way, it means your water supply has a high level of minerals, including calcium.

    But wait, calciums a good thing, isnt it? It makes strong, healthy bones and teeth. Sure, thats true. But its not so good for your pool and all the expensive equipment you bought to keep it clean and healthy.

    Over time, an out-of-whack calcium hardness level can do some real damage, which is why its so important to monitor and balance the calcium hardness in your pool.

    How Much Baking Soda To Add To Pool: And Why

    How to add calcium to your swimming pool

    by Pool and Patio Editorial | Apr 8, 2020 | Pool Cleaning Tips |

    Having a pool has a way of turning you the owner into a chemist, without you knowing it. With so many tests and measurements needed to ensure the quality and safety of your pool, you will find yourself working almost like a chemist in your free time. With baking soda, however, you can maintain the quality of water in your pool, without having to go through the stress of running so many tests. Baking soda is safe and straightforward to use, while also providing your pool with a clean, clear, sparkling water that is pleasant to swim in. Baking soda does not sting the eyes neither can it cause drying of the skin.

    In case you are wondering how baking soda works, and how you can use it to improve the water quality of your pool, just keep on reading as I open you up to the many benefits of this excellent substance.

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    Lowering Calcium Hardness Level:

    • Drain a portion of your pool water and replace it with softer water
    • If your source water has high calcium check your local business directory for pool water delivery
    • If replacing the water isnt an option, you can use a flocculant to attract the excess calcium and cause it to clump. After you use the flocculant, clean the walls and floors of your pool to remove the excess calcium and then backwash and clean your pump filter.

    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.


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    How To Manage Your Pools Calcium Hardness

    There are a few steps you need to take to properly balance the calcium hardness in your pool.

  • Do a thorough clean of your pool. Making sure to brush the walls of your pool, vac the pool and backwash the filter to remove any contaminates.
  • Balance your water chemistry by bringing your pH and alkalinity levels to the correct range. Both of the chemicals used to correct imbalances will affect your calcium hardness.
  • If after doing these steps your calcium hardness tests at above 400ppm then you will need to lower your calcium hardness levels. If it is below 150ppm then you will need to raise the calcium hardness.
  • A Swimming Pool Chemical Calculator

    Managing Total Hardness Level for a Balanced Pool: Clorox® Pool& Spaâ¢

    Adjust sliders to calculate pool calcium hardness

    Swimming pool calcium hardness must be managed to maintain balanced pool water. Recommended range for pools is between 200-400 ppm. Having the calcium hardness out of range can lead to problems with water quality and equipment damage. Calcium hardness should be tested regularly using test strips or reagents.

    More About Pool Calcium Hardness

    • Pitting of concrete pool surfaces
    • Plaster etching

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