Maintaining proper water chemistry is essential for creating a safe, comfortable, and enjoyable spa experience. One crucial aspect of water balance is calcium hardness, which refers to the amount of dissolved calcium and magnesium minerals in your spa water. When calcium hardness levels are too low, it can lead to corrosion of spa surfaces and equipment and an uncomfortable soaking experience. This is where calcium hardness increasers come into play.

Let’s explore the importance of calcium hardness in spa water, how calcium hardness increasers work, and the top 3 brands available.

Best Spa Calcium Hardness Increaser

What is Calcium Hardness and Why is it Important in Spa Water?

Calcium hardness measures the total amount of dissolved calcium and magnesium in your spa water. These minerals are vital in maintaining proper water balance and protecting your spa’s surfaces and equipment from damage.

The ideal range for calcium hardness in spa water is between 150 and 250 parts per million (ppm). When calcium hardness levels fall below this range, the water becomes “soft” and can cause several issues:

  1. Corrosion: Soft water is more aggressive and can corrode metal components in your spa, such as heaters, pumps, and fittings, leading to costly repairs or replacements.
  2. Etching: Low calcium hardness can cause etching and pitting of spa surfaces, particularly in acrylic or fiberglass shells. This results in a dull, rough appearance and potential leaks.
  3. Foaming: Soft water is more prone to foaming, leading to excessive bubbles and an unsightly, less enjoyable spa experience.
  4. Discomfort: Water with low calcium hardness can feel slippery or slimy, making for an uncomfortable soaking experience and potentially causing skin and eye irritation.

What is a Calcium Hardness Increaser?

A calcium hardness increaser is a chemical product designed to raise the calcium hardness levels in your spa water. These products typically contain calcium chloride or calcium sulfate, which dissolve in the water and provide the necessary calcium ions to bring the levels into the ideal range.

Calcium hardness increasers are easy to use and can quickly correct low calcium hardness levels, helping to protect your spa and ensure a more enjoyable soaking experience.

Top 3 Spa Calcium Hardness Increaser Brands

When choosing a calcium hardness increaser for your spa, look for reputable brands formulated to effectively raise calcium levels without negatively impacting other water chemistry parameters. Here are the top 3 spa calcium hardness increaser brands:

What is a Calcium Hardness Increaser

1. Spa Choice Calcium Hardness Increaser

Spa Choice Calcium Hardness Increaser is a top-rated product for spas and hot tubs. This fast-acting formula contains high-quality calcium chloride, which quickly dissolves in water to raise calcium hardness levels.

Key features:

  • Rapidly increases calcium hardness levels
  • Easy to use granular formula
  • Suitable for all spa and hot tub types
  • Won’t affect pH or alkalinity levels

2. Leisure Time Calcium Booster

Leisure Time Calcium Booster is another highly effective calcium hardness increaser designed for spa and hot tub use. This product uses a blend of calcium chloride and other water-conditioning ingredients to raise calcium levels while helping to prevent scale formation and maintain water clarity.

Key features:

  • Fast-acting formula quickly raises calcium hardness
  • Helps prevent scaling and maintains water clarity
  • Easy to use granular form
  • Compatible with all spa sanitizers and water types

3. Clorox Spa Calcium Hardness Increaser

Clorox, a well-known name in the pool and spa industry, offers its Spa Calcium Hardness Increaser as a reliable solution for low calcium levels. This product contains high-grade calcium chloride and is formulated to dissolve quickly and evenly in spa water.

Key features:

  • Rapidly raises calcium hardness levels
  • Easy to use granular formula
  • Suitable for all spa and hot tub types
  • Won’t affect pH or alkalinity levels

How to Use a Calcium Hardness Increaser in Your Spa

Using a calcium hardness increaser is a simple process, but it’s essential to follow the manufacturer’s instructions carefully to ensure the best results and avoid over-correcting the levels. Generally, the steps involve:

  1. Test your spa water to determine the calcium hardness level and the amount of increaser needed.
  2. With the spa pump running, add the recommended dosage of calcium hardness increaser to the water, distributing it evenly over the surface.
  3. Allow the spa to circulate for at least 30 minutes to ensure thorough distribution.
  4. Retest the calcium hardness level after 24 hours and repeat the treatment if necessary, following the manufacturer’s maximum dosage and frequency guidelines.

Maintaining proper water balance and monitoring other chemistry parameters, such as pH and total alkalinity, is crucial when using calcium hardness increasers. Regular water testing and adjustments will help ensure the best results and prevent potential issues related to imbalanced water chemistry.

Frequently Asked Questions (FAQs)

How often should I test calcium hardness in my spa?

It’s recommended to test your spa’s calcium hardness levels at least once a month or more frequently if you notice signs of low calcium, such as etching, corrosion, or foaming. Regular testing helps you identify and address any imbalances promptly, preventing potential damage to your spa.

Can I use a pool calcium hardness increaser in my spa?

While some pool calcium hardness increasers may be suitable for spas, choosing a product specifically designed for spa and hot tub use is always best. Spa-specific increasers are formulated to work effectively in the unique conditions of spa water, such as higher temperatures and smaller volumes, without affecting other water chemistry parameters.

What happens if I add too much calcium hardness increaser to my spa?

Adding too much calcium hardness increaser can lead to excessively high calcium levels, which can cause scaling, cloudy water, and reduced heating efficiency. If you accidentally overdose your spa, the best action is to partially drain the water and refill it with fresh water to dilute the excess calcium. Always follow the manufacturer’s instructions and start with small doses to avoid over-correcting the levels.

Can low calcium hardness cause spa foam?

Yes, low calcium hardness can contribute to excessive foaming in your spa. When calcium levels are too low, the water becomes “soft” and more prone to foaming, especially when combined with body oils, lotions, and other contaminants. Maintaining proper calcium hardness levels helps reduce foaming and ensures a more enjoyable spa experience.

How does calcium hardness affect spa sanitizers?

Calcium hardness can indirectly impact the effectiveness of spa sanitizers, such as chlorine or bromine. When calcium levels are too low, the water becomes more corrosive and can degrade sanitizers more quickly, reducing their ability to keep the water clean and safe. By maintaining proper calcium hardness levels, you help create a more stable environment for sanitizers to work effectively.

Conclusion

Maintaining proper calcium hardness levels is crucial for protecting your spa’s surfaces and equipment and ensuring a comfortable and enjoyable soaking experience. By understanding the importance of calcium hardness and using a high-quality calcium hardness increaser when needed, you can keep your spa water balanced and avoid potential issues associated with low calcium levels.

When selecting a calcium hardness increaser, choose products from reputable brands like Spa Choice, Leisure Time, and Clorox, which are specifically formulated for spa and hot tub use. Always follow the manufacturer’s instructions for dosage and application, and regularly test your spa water to monitor calcium hardness and other essential parameters.

By prioritizing calcium hardness and overall water balance, you can extend the life of your spa, minimize maintenance costs, and enjoy a luxurious, relaxing spa experience whenever you desire.