How to Lower Pool Water Hardness? Step-by-Step Guide

How to Lower Pool Water Hardness? Step-by-Step Guide

Here’s everything you need to know about How to Lower Pool Water Hardness since it is a major issue for pool water. You need to know about water hardness and how to manage the hardness of pool water. But don’t worry. You’ll get it all here.

Water hardness means that your water supply has a high level of minerals, including calcium, that can leave deposits and build-up. So, if your water hardness levels in your pool are too high or even 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 lower pool water hardness, and it will become much easier for you to make your pool water in good condition.

If you want to increase calcium hardness read mentioned article.

How to Lower Pool Water Hardness?

If your calcium hardness level is too high in your pool, the water will be hard, and the first sign is usually a cloudy pool. Normally you can clear a cloudy pool with a shock or water clarifier. 

However, if the cloudiness doesn’t go away after shocking your pool even a couple of times, you could have too much calcium in the water, and you may also notice a build-up of calcium on the full surface.

So, here arises the question: How to lower pool water Hardness? There are a few steps. By following them, you can easily lower pool water hardness which is given below:

1. Test Your Water Source

If the Calcium level is high, try using a hose filter to keep some of those minerals out. Then you can drain some of the cool water and replace it with fresh filtered water. It is also called dilution.

2. Use Pool Flocculant

You can try using a pool flocculant to clump up the excess calcium, and once the clumps form and fall to the bottom of your pool. You need to vacuum them out through your filter waste manually.

Go and read our article on Best pool vacuum if you are in search of it.

However, ensure that your filter is way set before using a pool flocculant. Just note calcium that’s already dissolved in the water will not be affected by flocculant. It only affects calcium solids that have not been dissolved in the solution. 

3. Try Muriatic Acid

You can add Muriatic acid as the last result. Now it won’t reduce your water hardness levels, but it will help bring your full water back into balance. You can add 2-3 capfuls of muriatic acid to lower the pool water hardness.

How to Lower Water Hardness in Hot Tub?

How to Lower Water Hardness in Hot Tub

The secret to keeping your water balanced is knowing basic hot tub water chemistry. We will cover three basics of hot tub water chemistry. 

I- Alkalinity

Firstly, we will discuss alkalinity, which will go hand in hand. When you start balancing your water’s chemistry, the first thing you will adjust is the alkalinity, specifically the total alkalinity.

However, total alkalinity is the water’s ability to neutralize acids. It acts as a buffer, reducing acidity in your hot tub water. You want to aim for an alkalinity level between 125 and 150 per million.

II- pH

pH measures whether a solution is basic or acidic. The pH scale goes from zero to 14, with seven right in the middle being neutral. The lower the pH, the more acidic the water is. The higher the number, the more basic it is.

However, you may want to aim for a pH level between 7.4 and 7.6, with 7.5 ideal. Now here the question is, why do alkalinity and pH work together? Because total alkalinity buffers acidity.

Moreover, adjusting the alkalinity first may be enough to bring the pH in line. If you need to increase alkalinity, you can use an alkalinity increase. However, if you need to bring the alkalinity down, you’ll use a pH decrease.

III- Calcium Hardness

It measures how hard the water in your hot tub is. If you live with hard water, you know you can get calcium deposits on faucets and shower heads. You got the water in your hot tub to be a little bit on the harder side.

The ideal calcium hardness level in your hot tub is 175 parts per million to 250 parts per million. So Alkalinity, pH, and calcium hardness are the chemicals you need to maintain your hot tub water chemistry. 

How to Soften Hot Tub Water?

Your hardness of hot tub water must be at 25 parts per million or lower. So, to achieve this kind of hardness, you can do a couple of things. First is the vanishing act. It is a simple little hack that you can do.

How to Soften Hot Tub Water

However, you can take your on-the-go water stopper and recycle the water by using this act. For this, 

  • First, take some water from the hot tub before running out of the softener and test to check the hardness.
  • Then, make sure that you are using a fully recharged on-the-go water softener.
  • After that, take the submersible pump. It is just a cup of coal pump that shuts off any submersible pump.
  • Then, drop the coal into the water and take a hose from that pump.
  • It is going to be just the regular garden hose. Just throw it into the tub, and when water starts running, turn it on, so the water runs from hot water, through the sulfur, back into the hot tub. 

We have separate article on best pool pump go and read it.

It is an easy and inexpensive way to soften the hot tub water. You can run it for a couple of hours. It depends on the hardness of your water. If the hardness is high, it takes more hours in softening it and vice versa.

Hard Water Test Kit

Hard Water Test Kit

A hard water test kit is used to test the hardness of the water. To get knowledge about how a hard water test kit works, follow the sample tips which are given below:

  • Rinse vial three times with sample to be tested
  • Ensure proper sample size
  • Use a level surface and bend down to eye level to verify an accurate sample.
  • Use a white surface to help see the colour changes
  • For this test, you need to fill the vial to 25 mL
  • According to the endpoint ID procedure, the next step is to add five drops of hardness buffer. 
  • After adding each reagent, it’s important to swirl the vial to make sure the reagents are properly mixed.
  • Now add the one scoop of hardness indicator powder, and it turns red, indicating that hardness is present, but if it turns blue, then no hardness is present.
  • According to the ID procedure, to perform the titration, ensure you have the proper titrant and the proper sample size. 
  • After adding each drop of titrant, you want to swirl the vial to make sure that the sample is properly mixed.
  • According to the ID, procedure titration is complete when the sample changes from red to blue.
  • Record your results.

FAQs: How to Lower Pool Water Hardness?

Water Hardness Reducers are used to lessen the hardness of the water. Ca(OH)2 (or CaO) and Na2CO3 (lime and pop) are regular synthetic substances utilized for reducing the water hardness.

Low Hardness in the pool is when pool water turns excessively delicate (for example, its calcium hardness dips under 150 ppm) it becomes corrosive. 

Low calcium levels will demolish your pool's alkalinity. It will, this way, erode metal things. Your pool's railing and mechanical parts could become harmed. Fortunately, it's simpler to raise water hardness than lower it.

A chemical water softener is a chemical that is used whenever pool water is too hard; a chelating agent can be added to deliver the calcium latently and make the water "softer". 

The specialist bonds with the calcium particle, holding it in arrangement and forestalling it back from plating out as scale (calcium carbonate). 


We have explained briefly How to Lower Pool Water Hardness? By reading these different methods, you will get different paths of knowledge about how you can lower 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 site for more such interesting 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.