How to Increase Calcium Hardness in Pool?

How to Increase Calcium Hardness in Pool?

Increasing calcium hardness can be a piece of cake if you know why and how to increase calcium hardness in pool? First of all, keep in mind that increasing calcium hardness is a lot easier that decreasing it. Now, let’s move forward.

Increasing calcium hardness simply means that your water supply has a low level of minerals, including calcium. Moreover, if your water Calcium hardness levels in your pool are too low, it can cause damage to your pool.

After reading this article, you will become familiar with the easiest and most popular techniques to increase Calcium Hardness in Pool. It will become much easier for you to make your pool water in good condition.

In order to know about How to lower Water Hardness read out mentioned article.

How to Increase Calcium Hardness in Pool?

If your Calcium Hardness level is too low, it means your water is soft, and that can corrode parts of your pool. Soft water can dissolve concrete and plaster and corrode metal parts that emerged or are touched by the water.

However, bringing the Calcium hardness levels up is much easier than lowering them. All you need to do is add a Calcium Hardness Increaser to your pool. Be sure to carefully follow the instructions on the package for the best results.

So, here is the question: How to Increase Calcium Hardness in Pool? There are a few steps; by following them, you can easily increase the Calcium Hardness in the Pool.

1- Dip the Test Strip

The test strip is used to check the calcium hardness level in the water. So, first of all, dip the test strip in the water at the deep end of the pool.

2- Read the Results

After removing the strip from the water, check the results by comparing the color on the strip to the color chart in the kit. If the level is below 200 ppm, you need to raise the level.

3- Measure Calcium Chloride

Measure out sufficient calcium chloride to raise the hardness level. Utilize 1 1/4 pounds of an item for every 10,000 gallons of water, assuming you want to raise the level by 10 ppm. 

However, utilize 2 1/2 pounds (per 10,000 gallons) to raise the level by 20 ppm, or utilize 6 1/4 pounds of item (per 10,000 gallons) to raise the hardness level by 50 ppm.

4- Mix the Solution

Fill a container with warm water. Add the deliberate measure of powdered calcium chloride to the water in slow sums. Never add water to the compound. Permit the item to break dissolve.

5- Pour the Solution

After making the solution pour it into the deep end of the pool. Gradually walk around the deep end, pouring in the mixture until it is all gone. After that, please turn on the pool filter and let it run for at least six hours.

6- Recheck the Hardness

After completing this process, recheck the Calcium hardness the next day. Assuming the level is correct, check the chlorine and alkalinity levels, and adjust them if needed. Return the pool filter to its normal operating schedule.

Increase Calcium Hardness

Increase Calcium Hardness

The calcium hardness range needs to be between 150 to 250 parts per million, and you can raise it by using Calcium Chloride, not Calcium Hypochlorite. That’s the chlorine you want to use to increase the Calcium hardness of your water.

Calcium is more for plaster pools, concrete pools, pebble tech, not for fiberglass or vinyl pools. We also have separate article on  Robotic pool cleaner for Vinyl pools. You can’t have it, you know, anywhere from 50 to 100 for fiberglass in vinyl pools, but it’s really important for plaster pools.

However, the reason for that is because water is hungry for Calcium, and it’s going to get it anywhere. It can be okay, so you have a plaster pool, and there’s Calcium Carbonate in the plaster, and that water will soften the whole surface.

And it starts ripping the pool service away, and that’s called pitting, and you don’t want that, so you have to satisfy your water’s hunger for Calcium. The best way to do that is to use Calcium Chloride.

Calcium Chloride is the baseline to raise your hardness 10 parts per million per 10,000 gallons. You will use one and a quarter pounds of Calcium Chloride. If you have a 20,000-gallon pool and you want to raise it ten ppm, double the amount of Calcium Chloride, and so on.

Increase Calcium Hardness in Hot Tub?

When the Calcium level goes down in the hot tub, it will increase the risk of equipment corrosion. It includes the jets, the heating elements, and even part of the shell itself.

Increase Calcium Hardness in Hot Tub?

However, too-soft water can also result in hot-tub foam, which shows that the Calcium hardness level is too low, and you will have to fix these issues. Balance water must range between 175 parts per million (ppm) and 250 ppm.

And there is the easiest way to increase the Calcium hardness in the hot tub by adding Calcium to the water. You want to add Calcium chloride, one of the active ingredients in calcium hardness increaser, made especially for hot tubs.

Raise Hardness in Pool

First of all, what is Calcium hardness? Calcium Hardness, also known as total hardness, measures how hard or soft your pool water is and measures the amount of dissolved calcium and magnesium in your swimming pool.

However, the ideal range for calcium hardness is 150 to 400 parts per million; if your pool’s total hardness level drops below the recommended 150 parts per million, it means you need to raise the hardness of your pool.

And the easiest and most common way to rate the swimming pool’s calcium hardness is by adding calcium hardness increasers such as calcium chloride to your swimming pool, raising your calcium hardness with calcium chloride.

Firstly, you have to test your pool for calcium hardness to determine how many parts per million you are from the midpoint of the ideal Calcium hardness range. Calcium chloride is the main chemical used to increase the water hardness for the pool.

 Moreover, add these per instructions on the product label. You should look up the amount to add based on your pool size and how much you want to increase your calcium hardness value in parts per million.

Raise Hardness in Pool

Usually, the instruction says NOT to dilute the Calcium Chloride in water. Instead, you should spread the amount you are adding by getting down close to the water and spreading (if in powder form) or pouring (if in liquid form) into the pool.

And make sure you are not spreading or pouring into the wind. After adding this, wait about 6 hours for the calcium chloride to dissolve into the water.

FAQs: How to Increase Calcium Hardness in Pool?

Yes, Calcium hardness affects pH. Calcium hardness is actively managed along with pH and alkalinity. Calcium carbonate treats water with a pH more prominent than 6, and manufactured magnesium oxide will treat water under 6. 

However, untreated water moves through the channel, loaded up with calcium carbonate (limestone) or a manufactured magnesium oxide medium. This material breaks down in the water and raises its pH level.

To test Calcium hardness in the pool, you need a test kit that measures the level of calcium hardness. There are some steps. By following them, you can easily test the Calcium Hardness in your pool.

  • First of all, make sure that the tester should be clean.
  • After that, fill the water up to the 25-milliliter mark
  • Add 20 drops of the first reagent, swirl it around
  • Now add the next reagent it's blue but turns the water red, so you should add five drops
  • After mixing, it will start changing its color into red
  • At last, add the reagent that changes its color from red to blue and tells about how much calcium hardness water has.


We have explained briefly How to Increase Calcium Hardness in Pool? By reading these different steps, you will get different paths of knowledge about how you can increase pool water hardness in very popular and easiest ways.

Keeping the calcium hardness level balanced can prevent most water problems on pool walls and equipment, keep away from shady and excluding pool water, and help keep your pool water adjusted. Visit our website for more such articles.

Testing and keeping up with the calcium hardness level will go quite far to give a balanced and healthy swimming pool. Just follow the techniques mentioned above and methods that make your pool water hardness in balance.