19 Best Calcium Hardness Increasers: Clear Water Solutions
The Best Calcium Hardness Increasers
The right calcium hardness level is crucial for maintaining a healthy pool, and sometimes adjusting it isn't as simple as adding more water. This comprehensive guide reviews the top calcium hardness increasers, comparing their effectiveness, ease of use, and value to help you find the perfect solution for your pool maintenance routine.
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HTS Turbo Calcium Plus Hardness Increaser
Made in the USA, this 14oz bottle of HTS Turbo Calcium Plus brings spa water hardness up by about 10 ppm with each use - just one level capful gets you there in a 500-gallon tub. The formula helps control foam, prevent metal corrosion, and works great with all HTS Turbo products plus chlorine, bromine, biguanide, and ozone systems. The space-efficient packaging keeps your storage area tidy while ensuring you've got plenty on hand for regular maintenance.
Leisure Pool Calcium Hardness Increaser
A well-known method for adjusting calcium hardness levels, this fine granule powder effectively raises calcium hardness by 10 ppm when 1.1 pounds are added per 10,000 gallons of water, making it popular among pool owners who need precise chemical balance. Its multiple applications beyond pool maintenance—including ice melting, dust control, and concrete acceleration—make it a versatile addition to any chemical toolkit.
SpaPure 1 Pound Calcium Hardness Increaser
This high-quality granular Calcium Hardness Increaser safely raises your spa water's hardness level while protecting your investment. The soluble flakes prevent corrosion and etching, ensuring your spa's delicate surfaces stay pristine. With reliable performance across all sanitization systems, this convenient 16oz container keeps your spa water balanced and protected.
Spa Essentials Calcium Hardness Increaser
This concentrated solution quickly raises your spa's calcium hardness to optimal levels, protecting your equipment and maintaining clear water. The easy-to-use formula generates no mess when added directly to the water, and its American-manufactured quality gives you peace of mind. Whether you're dealing with cloudy water or simply maintaining proper spa chemistry, this single-step treatment delivers consistent results every time.
SpaGuard Calcium Hardness Increaser
This easy-to-use calcium hardness increaser raises levels by 25 ppm per 100 gallons, preventing equipment corrosion and surface etching. With a proven track record from experienced spa owners, it's the reliable choice for maintaining optimal water conditions.
Robelle 2808B Calcium Hardness Increaser
The Robelle calcium hardness increaser helps maintain your pool water at the right balance, preventing damage to surfaces and equipment. Made from food-grade calcium chloride, this 8-pound bag raises pool hardness without harsh chemicals. Users love its effectiveness and ease of use, with both praising how well it works when added according to the simple instructions.
Hard Up Calcium Hardness Increaser
This handy 10lb bag quickly raises calcium hardness in your pool or spa, giving your water that crystal-clear appearance you love. When you're not swimming, its granular formula doubles as an effective ice melt solution for driveways and walkways. The compact 9" x 5" x 13" bag takes up minimal storage space while delivering big results for your water maintenance needs.
Haviland Calcium Hardness Increaser
A 4-pound container of calcium hardness increaser that raises pool water hardness through calcium di-chloride, preventing surface corrosion and maintaining optimal swimming conditions. The product gradually raises calcium levels to between 200 and 400 ppm when dissolved in the pool, with precise instructions for achieving specific hardness increases while ensuring safe pool conditions.
Puri Tech Calcium Hardness Increaser
This compact pool chemical raises calcium levels efficiently without messy residue, as several satisfied users have noted. The convenient 5-pound bag fits comfortably on your pool shelf, measuring just 12 inches long. Most importantly, it works exactly as advertised to prevent costly equipment damage and maintain your pool's surface integrity.
in The Swim Calcium Hardness Increaser
When your pool's calcium hardness drops below 150 ppm - which can happen due to heavy rain or excessive water evaporation - this 5-pound bag of calcium chloride quickly raises the hardness level by about 50 ppm per treatment. The convenient granular form prevents clumping and makes measuring simple, ensuring consistent results. Most users report quick, effective hardness increases without any issues, making it a reliable choice for maintaining balanced pool water.
Pool Mate Calcium Hardness Increaser (8 lbs)
When your pool water's calcium hardness drops below 200 ppm, Pool Mate Calcium Plus helps bring it back up to a healthy range of 200-400 ppm. This specially formulated granular additive prevents corrosion of pool equipment and plaster, while also stopping unsightly stains from forming. Each 8-pound bag treats 10,000 gallons of water, raising hardness levels by about 50 ppm per application.
Clorox Pool & Spa Calcium Hardness Increaser
This Clorox pool additive raises calcium hardness when levels are low, helping prevent damage from corrosion and staining in plaster pools and soft water areas. The granular formula works well when dissolved before adding to your pool, though some users recommend sweeping the pool afterward to avoid any remaining clumps.
Pool Mate Calcium Increaser
When your pool water feels too soft, this handy calcium increaser gives it just the right boost. The 25-pound bucket makes it easy to lift and store, and you can split it into two 12.5-pound portions for exactly the amount you need. -users love that it Raises calcium hardness levels without breaking the bank, making their pool water healthy and protective for years to come.
PuriTech 25 lb Calcium Hardness Increaser
This versatile calcium hardness increaser brings pool water into the ideal range of 200-450 ppm, preventing equipment damage and surface staining while maintaining crystal-clear water quality. The handy 25-pound formula works quickly to correct low hardness levels, ensuring your pool chemistry stays balanced for a season of perfect swimming.
Hth Calcium Hardness Increaser
Balancing your pool's calcium hardness keeps your water crystal clear and your surfaces pristine. This easy-to-use granule raises calcium levels, protecting your pool from corrosion and extending the life of your equipment. The resealable bag makes it a practical addition to your pool care arsenal.
Pool Mate Calcium Increaser
This compact calcium hardness increaser helps maintain your pool's water balance, preventing costly corrosion and surface damage. At just $15, it's a practical solution for achieving the ideal 200+ hardness level your pool equipment needs to work efficiently.
Robelle 2825B Calcium Hardness Increaser
Raising your pool's calcium hardness to a healthy level requires precision, and Robelle Calcium Plus delivers with its proven performance. Each 25-pound bag effectively treats your pool water, ensuring it stays within the optimal range of 200-400 ppm to avoid equipment corrosion and surface staining.
Pool Time 4 lbs Calcium Hardness Increaser Balancer
When your pool's calcium levels are low, it can lead to equipment corrosion and surface etching - but this handy additive helps prevent both. The easy-to-use granules raise calcium hardness to the ideal range of 175-225 parts per million, giving your pool water balance a much-needed boost.
HTH Calcium Hardness Increaser
The HTH Calcium Hardness Increaser efficiently raises your pool's calcium levels, protecting surfaces and equipment from damage while maintaining water balance. The convenient 4-pound formula works with all pool types, ensuring optimal calcium hardness between 200-500 ppm. Users consistently praise its effectiveness and ease of use, with many recommending it as a reliable addition to their pool maintenance routine.
Buyer's Guide
Calcium hardness increasers are essential for maintaining proper water chemistry in swimming pools and spas. These products raise calcium levels and prevent the formation of scale and cloudy water. Understanding their function and proper usage is crucial for pool maintenance.
What is Calcium Hardness?
Calcium hardness refers to the concentration of calcium ions in your pool water. Ideal levels range from 200-400 ppm (parts per million). Calcium hardness protects pool surfaces from corrosion and prevents calcium scale formation, which can damage equipment and reduce water clarity.
How Calcium Hardness Increasers Work
These products contain calcium compounds that dissolve slowly in water, increasing calcium levels over time. The most common types are calcium chloride and calcium hypochlorite (pool shock). The choice depends on your current water chemistry and desired raise in hardness.
Factors Affecting Calcium Level Changes
Temperature, evaporation, and the addition/removal of water all impact calcium levels. Higher temperatures and significant water changes require more frequent testing and adjustment. Regular monitoring and proper dosage ensure consistent results without over-saturation.
Proper Usage and Considerations
Always test your water before adding a calcium hardness increaser. Follow manufacturer instructions carefully, as overdosing can lead to scale formation. For accurate results, completely drain the product before adding more, and maintain proper water balance with pH and alkalinity levels.
FAQ
What is a Calcium Hardness Increaser?
Calcium hardness increasers are specialized chemicals used to raise and maintain the calcium hardness level in swimming pool water. These products contain calcium compounds, typically calcium chloride or calcium hydroxide, which react with water to increase its mineral content.
By raising calcium hardness, these solutions help prevent scale formation, improve sanitizer effectiveness, and maintain water balance, particularly in pools with plaster finishes or fiberglass shells that benefit from consistent calcium levels.
How Do Calcium Hardness Increasers Work?
These products dissolve in water, releasing calcium ions. Over time, these ions combine with bicarbonate ions to form calcium bicarbonate, which raises the overall calcium hardness of the water.
Calcium hardness increasers work best when added gradually over several days, as opposed to large quantities at once, to avoid shocking the pool water and to ensure even distribution of the added calcium ions.
What are the Benefits of Using a Calcium Hardness Increaser?
Using a calcium hardness increaser helps maintain optimal water balance, preventing both under-saturated water that can lead to scale formation and over-saturated water that can cause cloudiness and mineral accumulation.
These products also help protect pool surfaces and equipment from damage caused by fluctuations in calcium levels, ensuring the longevity of both the pool and its components.
When Should I Use a Calcium Hardness Increaser?
Calcium hardness levels should be monitored regularly, and an increaser should be used when levels fall below the recommended range of 200-400 ppm (parts per million) for most pools.
Regular use is essential for pools with plaster finishes, fiberglass pools, and those that experience heavy use, as well as during periods of high evaporation when calcium levels tend to drop.
Can I Overuse a Calcium Hardness Increaser?
Yes, overusing a calcium hardness increaser can lead to excessively high calcium levels, known as calcium supersaturation, which can cause scaling issues on pool surfaces and equipment.
It's important to test calcium levels regularly and adjust the addition rate based on test results, typically adding small amounts over several days rather than large amounts at once.
What Other Chemicals Interact with Calcium Hardness Increasers?
Calcium hardness increasers can interact with certain pool chemicals, particularly acid reducing agents and metal cleaning products. These interactions can affect the effectiveness of both the calcium increaser and the other chemicals.
Always check compatibility with other pool chemicals and follow manufacturer instructions for proper water balancing, as interactions can influence pH and total alkalinity levels.
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