How To Balance Your Pool’s Calcium Hardness Level

To prevent calcium development, stains, or corrosion on your pool surface, calcium hardness in water must be balanced just like all other aspects of water chemistry. Therefore, testing every few months is typically sufficient because, unlike pH and chlorine, the calcium content in most pools does not vary significantly over the seasons.

As a result, high or low calcium hardness can result in etching, discoloration, or white staining on pool surfaces. Keep in mind that the key is to keep the calcium at the proper level.

What Is Calcium Hardness?

I assume you’ve heard of hard water. If you have not, hard water is a term used to indicate that the calcium content of your water source is excessive.

But is calcium not supposed to be good for us? After all, it creates sturdy, wholesome bones and teeth, right? Yes, that is right. However, it’s not so great for your pool and all the pricey equipment you purchased to maintain its cleanliness and health.

It’s critical to monitor and regulate the calcium hardness in your pool since an unbalanced level of calcium can cause serious harm over time. But make sure your pool’s overall alkalinity level is balanced first, then the pH, and finally the calcium hardness level, before attempting to balance it. Calcium hardness should be between 150 and 400 ppm (parts per million).

Low Calcium Hardness

Pool water turns corrosive when it becomes too soft (i.e., when its calcium hardness falls below 150 ppm). Low calcium levels will result in substantial long-term damage, particularly to plaster, vinyl liners, the grout between tiles, metal rails, and even the concrete pool decking. You wouldn’t believe how aggressive plain old water is. 

There is no way to repair soft water damage after it has been done. The only way to repair soft water damage is to replace or resurface the affected area, thus it’s critical to keep your pool’s calcium hardness above 150 ppm.

How To Raise Calcium Hardness In Your Swimming Pool?

The simplest and most popular technique to improve swimming pool calcium hardness if it falls below the necessary 150 ppm level is by adding a calcium hardness increaser, such as calcium chloride.

High Calcium Hardness

When a pool’s calcium hardness level is too high, it becomes basic and oversaturated with dissolved particles, including calcium, similar to when a pool’s pH level is too high. Over time, the pool water will start to cloud up, and the extra dissolved particles in the pool will cause the water to scale in and around your pool equipment. This might potentially clog and obstruct the flow of water in and out of the pool, which could harm your pool equipment.

How To Lower Calcium Hardness In Your Swimming Pool?

The only genuine solution to reduce the high calcium hardness level of your pool is to drain it partially or entirely and refill it with new clean and fresh water.

But you can use pool floc to clump the extra calcium if you are unable or unwilling to empty your pool’s water. You’ll have to manually vacuum your pool to get rid of the clumps once they’ve formed. Before adding floc to the water, be sure to turn off your pump and filter. Avoid getting any flocculant in your filter to avoid having to change the filter. In order to achieve this, you must also make sure to vacuum thoroughly. Therefore, if you have a cartridge filter, you cannot use floc.

As a final option, add muriatic acid if draining and floc don’t help. Although it won’t truly lessen the calcium hardness of the water, it will increase the saturation level, which can aid in restoring the water’s equilibrium.

Of course, maintaining your pool, keeping the water balanced, and preventing the calcium from going too high or too low are the greatest ways to avoid any calcium hardness issues.

To achieve this, keep the pool tidy. You can avoid issues with calcium hardness as well as many other issues by closely monitoring the chemistry of your swimming pool. 

Always test the water. The importance of this increases if your water supply is hard. You can stay on top of things by testing every week, or at most every two weeks. Select test strips that also measure calcium hardness or get a liquid test kit.

Identify issues early. Don’t wait for excessive water hardness before attempting a remedy. Take action as soon as you see the level edging a bit too close to either the lower or upper limit of the recommended range for your pool.

Final Thoughts

You only need to be on the lookout for it. You simply can’t neglect pool upkeep and assume everything will be great once you go back into your routine. More problems with calcium hardness and other issues are more likely to arise the longer the water chemistry is neglected.

Having a pool should be enjoyable. Your pool will need less labor and allow you to enjoy it more if you take better care of it.