How To Remove Water Hardness From Pool EASY

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As a pool owner, it is normal to want a water hardness reducer for pools. I mean, it sucks when you want to swim, and then the whole thing is clouded.

Normally, Pool shock is used to clear cloudy pools. However, if after shocking, the cloudiness doesn’t dissipate, especially if you repeat the BBB process over and over again, it could be too much calcium in the water.

If left untreated, you will begin to notice a buildup of calcium sediment on pool surfaces. If that happens, it’s time – past time, really – to reduce the calcium levels in your pool.

So, How do I decrease Water Hardness in my Pool?

  • Water softener with Submersible Pump

Personally, I have had luck with using regular water softener (CHECK ON AMAZON) and a submersible pump (CHECK ON AMAZON) as my calcium hardness reducer. It went from 700-200 in almost two weeks.

Ideally, any resin-based water softening unit will work. You simply need to pump water through it via any pump you have handy.

Just pump the water via the softening tank and then pipe it back to the pool.

A submersible pump is a water pump you drop into your pool, the kind that they typically use for water ponds and stuffs.

  • Zeolite in Sand Filter

Zeolite (BUY ON AMAZON) is perhaps the cheapest way to increase calcium hardness in pool. You simply add it to your sand filter and it will suck up the hardness.

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As follow-up, you should dump some salt into the filter every now and then to displace the calcium which can then be backwashed out.

  • Chemical Water Softener For Pools

Using commercial pool products such as chemical water softener for pools to remove the hardness is another means of getting rid of the calcium levels.

They can be used once off if the hardness in your pool is in accumulation, or can be added weekly if the fill water is very hard.

Keeping the pH a little low (pH 7.0) can prevent scale problems associated with hard water.

One of such products to try is a liquid product called Metal-Out (CHECK ON AMAZON). I think it also has something relating to stain removal in sub-title under product name. Comes in a quart bottle. Follow manufactures instructions & you should be in business.

Still need more recommendations, you can continue reading for more ideas on how to reduce calcium hardness in pool.

ALSO SEE: How To Remove Water Hardness & Soften at Home

How To Remove Water Hardness From Pool

Once your water test (BUY TEST KIT ON AMAZON) shows a high calcium level, the next move is to bring it down. Here some cheap water hardness reducer methods you can try:

  • Drain and Replace Some Water

Before you initiate water replacement, you should test (BUY TEST KIT ON AMAZON) your water source. If the results come back high, then you need to try using a hose filter to eradicate some of the minerals. Otherwise, this move will just be for nothing.

  • Use Pool Flocculant

Don’t want to drain your pool water, then you should try using a pool floc to clump the excessive calcium.


As soon as the clumps form, you should manually vacuum your pool to get rid of them.

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Note: You should turn your filter and pump off before putting floc in the water. You don’t want to get any flocculant in your filter, or you’ll need to replace the filter medium.

To that end, you will also need to make sure you vacuum to waste. That means you cannot use floc if you have a cartridge filter.

  • Muriatic Acid

If you’ve attempted draining and doing floc and those still don’t work, then you can add muriatic acid as a last resort. It won’t reduce the water’s calcium hardness, but it will get rid of the saturation level, that can help return the water to balance.

So, will muriatic acid lower hardness in pool? Yes, using muriatic acid helps in the reduction of water hardness in pools.

But, how much muriatic acid to lower hardness in pool? We recommend 20 fluid ounces of muriatic acid for 10,000 gallons.

How To Remove Water Hardness From Pool

What If the Water Is Too Soft?

It sounds funny, right? I mean, how can water be too soft? It makes no sense. However, when it comes to water in your pool, this could happen and it calls for concern.

A too-soft will be corrosive to your pool. It can dissolve plaster and concrete, and corrode whatever metal parts submerged in or touched by the water.

Once damaged, it will lead to expensive repairs if you refuse to bring the calcium hardness back up.

How to Raise Calcium Hardness Levels

The good news is that – it is possible to bring your hardness level up so much easier than lowering it. All you need to increase is to just add some calcium hardness increaser to your pool. Ensure you read the directions on the package before use to get the best results.

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A simple trick that helped me is by knowing my pool’s volume, using a pool calculator.

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How to Get the Perfect Range

The best means of avoiding calcium hardness problems is by maintaining your pool, the correct way. Ensure it is balanced, and prevent the calcium from getting too low or too high.

How to Keep Your Pool Clean.

  • Balance the water

Ensure you keep a close eye on your pool chemistry to aid in the prevention of problems related to calcium hardness, and plenty of other stuffs as well.

  • Test the water Constantly

If you live in an area with naturally hard water, it is crucial to test your water (every week or two weeks at most). That will help you stay ahead of the game.

Ensure you pick buy test strips (BUY TEST KIT ON AMAZON) that include calcium hardness, or et a liquid test kit.

  • Address Problems Early

Don’t wait for your water hardness to become a problem before you try to fix it. As soon as you notice the level getting a little too close to the lower or upper limit of the recommended range for your pool, TAKE ACTION!

Will Baking Soda Soften Pool Water?

Yes, baking soda will soften pool water, clear cloudy pool and make the water softer on your skin.

Balancing Calcium Hardness is no Rocket Science

It just requires you pay close attention to details. Pool maintenance should be top priority if you own one. The longer you allow the water chemistry go out of balance, the more likely it is that you will soend fighting calcium hardness, and several other problems.

Owning a pool should be fun. The better you care for your pool, the less work it will be, and the more you can enjoy it.

The steps shared in the guide are the secrets on how to reduce calcium hardness in pool.

Author: Howard S. Baldwin

My name is Howard S. Baldwin. I am a work-at-home dad to three lovely girls, Jane + Hannah + Beauty. I have been blogging for the last 3 years. I worked for other Home and Lifetsyle blogs, did hundreds of product reviews and buyers’ guides. Prior to that, I was a staff accountant at a big accounting firm. Needless to say, researching and numbers are my passion. My goal is to be an informative source for any topic that relates to DIY life and homemaking.

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