Top 10 Best pool calcium in 2026

Last Updated - 6/13/2026

🏆Best Choice

CLOROX Pool&Spa

Clorox® Pool&Spa™ Swimming Pool Calcium Hardness Increaser, Prevents Corrosion, Etching and Staining, 4LB (Pack of 1)

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•Prevents Corrosion, Etching, and Staining: With Clorox Pool&Spa Swimming Pool Calcium Hardness Increaser, you can safeguard your pool against corrosion, etching, and staining, ensuring its longevity and pristine appearance. Our product offers reliable protection, giving you peace of mind while you enjoy your pool.
•Increases Low Total Hardness Levels: This product helps increase the low total hardness levels in swimming pool water, ensuring a balanced and stable environment for your pool. It restores water parameters to their ideal ranges.
•Extends Equipment Life: Unbalanced water can cause a corrosive environment that damages your pool surfaces or equipment. This product prevents pool surface damage, reduces pool maintenance, extending the life of your pool's cleanliness.
•Compatibility: Our Clorox Pool&Spa Swimming Pool Calcium Hardness Increaser is ideal for plaster pools and areas with soft water.
•Clorox Pool App: Test like an expert anytime, anywhere with the Clorox Pool App. Solve common swimming pool problems and get personalized product and dosage recommendations.

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$11.82

$12.99

-9%

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Robelle

Robelle 25-Pounds Premium Pool Calcium Up, Calcium Hardness Increaser

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•Calcium chloride for pools
•Rapidly increases total hardness
•Helps prevent corrosion or etching of pools
•Ideal calcium hardness range 200 - 400 ppm
•8 ounces raises calcium hardness level 10 ppm per 5,000 gallons of water
•Prevents the staining or etching of your pool's surface
•Low calcium hardness level can cause water issues

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$36.00

$42.41

-15%

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Pool Mate

Pool Mate 25-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•Calcium chloride for pools
•Rapidly increases total hardness
•Helps prevent corrosion or etching of pools
•Ideal calcium hardness range 200 - 400 ppm
•8 ounces raises calcium hardness level 10 ppm per 5,000 gallons of water
•Prevents the staining or etching of your pool's surface
•Low calcium hardness level can cause water issues

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$45.10

$47.23

-5%

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Pool Mate

Pool Mate 8-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Calcium chloride for pools
•Rapidly increases total hardness
•Helps prevent corrosion or etching of pools
•Ideal calcium hardness range 200 - 400 ppm
•8 ounces raises calcium hardness level 10 ppm per 5,000 gallons of water
•Prevents the staining or etching of your pool's surface
•Low calcium hardness level can cause water issues

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$21.80

$25.61

-15%

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In The Swim

In The Swim Calcium Hardness Increaser for Swimming Pools - Fast-Acting, Scale Prevention - 94% Calcium Chloride - 25 Pounds

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•Boost Water Quality: Prevent cloudy, dull water by restoring the right calcium levels in your pool
•Protect Your Pool: Helps stop costly damage like corrosion and pitting on pool surfaces and equipment
•Easy-to-Use Granules: Fast-dissolving formula works quickly—just measure, pour, and circulate
•Dial in the Perfect Balance: Raise hardness 50 ppm per 6 lbs per 10,000 gallons—easy, accurate, and powerful
•Multi-Use Chemical: Highly effective for swimming pools—and also serves as an industrial-grade ice and snow melt

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$59.99

$64.99

-8%

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In The Swim

In The Swim Calcium Hardness Increaser for Swimming Pools - Fast-Acting, Scale Prevention - 94% Calcium Chloride - 45 Pounds

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•Boost Water Quality: Prevent cloudy, dull water by restoring the right calcium levels in your pool
•Protect Your Pool: Helps stop costly damage like corrosion and pitting on pool surfaces and equipment
•Easy-to-Use Granules: Fast-dissolving formula works quickly—just measure, pour, and circulate
•Dial in the Perfect Balance: Raise hardness 50 ppm per 6 lbs per 10,000 gallons—easy, accurate, and powerful
•Multi-Use Chemical: Highly effective for swimming pools—and also serves as an industrial-grade ice and snow melt

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$84.99

$90.54

-6%

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Pool Mate

Pool Mate 25-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride, Made in USA

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Calcium chloride for pools
•Rapidly increases total hardness
•Helps prevent corrosion or etching of pools
•Ideal calcium hardness range 200 - 400 ppm
•8 ounces raises calcium hardness level 10 ppm per 5,000 gallons of water
•Prevents the staining or etching of your pool's surface
•Low calcium hardness level can cause water issues

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$36.00

$52.34

-31%

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HTH

HTH 67059 Swimming Pool Care Calcium Hardness Up, Swimming Pool Chemical Protects Swimming Pool Surfaces and Liners, 4 Lbs

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•BENEFITS: Raise the calcium hardness of your swimming pool water to protect your pool surfaces and equipment from harm
•COMPATIBILITY: Pool care chemical works with all swimming pools
•RAISES CALCIUM HARDNESS LEVELS: Helps prevent swimming pool water from becoming corrosive
•PROTECTS & PREVENTS CORROSION: Protects pool liners, metal, and plastic surfaces as well as equipment from damage
•YOU'RE ALL CLEAR WITH HTH: For best results, use HTH 6-Way Test Strips weekly to test, balance and maintain calcium hardness levels between 200 and 500 ppm

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$10.49

$13.00

-19%

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LayorCare

LayorCare Heavy Calcium Releaser - Calcium Build Up Remover for Pool Tiles and Decks, Natural Stone, Rock Water Features, and More - 1 Quart

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•COVERAGE - Our spray cleaner solution covers up to 75 sq ft per quart, ensuring efficient results specially for pool tile cleaning and outdoor use
•FULL STRENGTH - Use our tiles cleaner at full strength, no need for dilution. Specifically designed as a tile calcium remover for effortless cleaning
•SAFETY - Our pool calcium remover from tile is non-toxic, will not affect water pH, and won't etch most surfaces. Feel confident using it, but always test in an inconspicuous area first
•CALCIUM BUILDUP REMOVER : This calcium releaser for pool tile is all you need to quickly remove heavy calcium and mineral deposits for all pool tiles, decks, natural stone, rock water features, and more.
•APPLICATION: Before applying, scrub surface of calcium with scrubbing pad or scraper blade to break up first layer of scum. Generously apply our cleaner for pool tile and let sit for a few minutes then scrub again, rinse and repeat if needed.

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$29.99

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Robelle

Robelle 16-Pounds Premium Pool Calcium Up, Calcium Hardness Increaser

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Calcium chloride for pools
•Rapidly increases total hardness
•Helps prevent corrosion or etching of pools
•Ideal calcium hardness range 200 - 400 ppm
•8 ounces raises calcium hardness level 10 ppm per 5,000 gallons of water
•Prevents the staining or etching of your pool's surface
•Low calcium hardness level can cause water issues

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$39.45

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