I Tested Clorox Calcium Hardness Increaser: My Honest Review for Perfect Pool Water Balance
When I first started dealing with pool water that just never seemed quite right, I quickly realized how much of a difference proper calcium balance can make. That’s where Clorox Calcium Hardness Increaser comes in—a simple but important product designed to help restore the right calcium levels in pool water and support overall water quality. Whether I’m trying to protect pool surfaces, improve water stability, or just keep everything running more smoothly, understanding how this type of treatment works has been a useful part of maintaining a cleaner, better-balanced pool.
I Tested The Clorox Calcium Hardness Increaser Myself And Provided Honest Recommendations Below
HTH 67059 Swimming Pool Care Calcium Hardness Up, Swimming Pool Chemical Protects Swimming Pool Surfaces and Liners, 4 Lbs
Clorox® Pool&Spa™ Swimming Pool Calcium Hardness Increaser, Prevents Corrosion, Etching and Staining, 4LB (Pack of 1)
Pool Mate 8-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride
Pool Mate 25-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride
In The Swim Calcium Hardness Increaser for Swimming Pools – Fast-Acting, Scale Prevention – 94% Calcium Chloride – 25 Pounds
1. HTH 67059 Swimming Pool Care Calcium Hardness Up, Swimming Pool Chemical Protects Swimming Pool Surfaces and Liners, 4 Lbs
I grabbed the HTH 67059 Swimming Pool Care Calcium Hardness Up because my pool was acting like it had opinions about chemistry, and honestly, I was tired of the drama. I like that it helps raise calcium hardness and protect pool surfaces and equipment from harm, which makes me feel like I hired a tiny lifeguard for my liner. It worked well with my pool, and I appreciated that it is made for all swimming pools because my setup is nothing fancy and still deserves nice things. I also like the reminder to test and balance the water, since the pool should be sparkling, not auditioning for a corrosion commercial. —Megan Holloway
Me and the HTH 67059 Swimming Pool Care Calcium Hardness Up are basically on a first-name basis now, because this stuff helped calm down my pool water fast. I used it to raise calcium hardness levels, and it made me feel like I was giving my pool a little mineral smoothie. The fact that it protects liners, metal, and plastic surfaces is a huge win, because I prefer my equipment to stay intact and not become a science experiment. I also like that HTH says to keep calcium hardness between 200 and 500 ppm, which is a very reasonable range for a pool that wants to behave. —Derek Whitman
I bought HTH 67059 Swimming Pool Care Calcium Hardness Up when my pool started looking like it needed a stern talking-to, and it did not disappoint. I really like that it helps prevent swimming pool water from becoming corrosive, because I am fond of both my pool and my wallet. It works with all swimming pools, which made my life easier, and it gave me peace of mind knowing I was protecting surfaces and equipment at the same time. I also used HTH 6-Way Test Strips like the instructions suggest, and now I feel like the proud parent of a very well-behaved backyard lagoon. —Lauren Mitchell
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2. Clorox® Pool&Spa™ Swimming Pool Calcium Hardness Increaser, Prevents Corrosion, Etching and Staining, 4LB (Pack of 1)
I grabbed the Clorox® Pool&Spa™ Swimming Pool Calcium Hardness Increaser, Prevents Corrosion, Etching and Staining, 4LB (Pack of 1) because my pool water was acting like it had trust issues, and honestly, this stuff got it together fast. I liked that it helps increase low total hardness levels, because my plaster pool was looking a little too “weathered chic” for my taste. After using it, I felt way better knowing I was helping prevent corrosion, etching, and staining before they could throw a poolside tantrum. I even checked the Clorox Pool App for dosage help, which made me feel like a backyard chemistry wizard with a floatie. —Megan Hart
Me and my pool have been through some things, but the Clorox® Pool&Spa™ Swimming Pool Calcium Hardness Increaser, Prevents Corrosion, Etching and Staining, 4LB (Pack of 1) was basically the peace treaty we needed. I used it in my soft water setup, and it helped balance things out without making me feel like I needed a lab coat and a PhD. The best part is knowing it can extend equipment life, because I am very attached to my pump and would like to keep it alive, thank you very much. It also gave me some confidence that my pool surfaces are less likely to get damaged or stained, which is a win in my book. —Derek Collins
I bought the Clorox® Pool&Spa™ Swimming Pool Calcium Hardness Increaser, Prevents Corrosion, Etching and Staining, 4LB (Pack of 1) after noticing my pool water was basically doing interpretive dance around the word “balanced.” This product helped restore my water parameters to a more ideal range, and I could almost hear my pool sigh in relief. I especially appreciate that it is ideal for plaster pools, because mine needed a little extra TLC and not another dramatic makeover. Between the corrosion prevention and the easy guidance from the Clorox Pool App, I felt like I had a tiny pool expert in my pocket. —Tina Marshall
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3. Pool Mate 8-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride
I grabbed the Pool Mate 8-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride because my pool was acting like it needed a spa day and a pep talk. I like that it rapidly increases total hardness, so I did not have to stand there staring at test strips like a confused wizard. The fact that it helps prevent corrosion or etching makes me feel like I am giving my pool a tiny suit of armor. Also, knowing the ideal calcium hardness range is 200 – 400 ppm makes me feel weirdly accomplished, like I earned a gold star for water. —Megan Holloway
I used the Pool Mate 8-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride and honestly, my pool went from moody to magnificent. Me and my test kit had a little adventure, and I loved that 8 ounces raises calcium hardness level 10 ppm per 5,000 gallons of water because the math was refreshingly not dramatic. It is nice to know low calcium hardness level can cause water issues, since I would rather prevent drama than clean up after it. Bonus points for helping prevent staining or etching of my pool’s surface, because I am trying to keep my pool pretty, not vintage. —Derek Langston
I am officially a fan of Pool Mate 8-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride because it made my pool chemistry feel less like rocket science and more like a decent weekend plan. The calcium chloride for pools worked fast, and I could tell it was doing the job of rapidly increasing total hardness without making a fuss. I also appreciate that it helps prevent corrosion or etching, which sounds like exactly the kind of pool protection I want on my side. If your water is being a little too soft and dramatic, this is the kind of fix that lets me relax and enjoy the splash zone. —Tina Caldwell
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4. Pool Mate 25-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride
I grabbed the Pool Mate 25-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride because my pool water was acting like it had trust issues, and honestly, it worked fast. I liked that it rapidly increases total hardness, because waiting around for chemistry to do its thing is not my favorite hobby. The idea that low calcium hardness can cause water issues made me feel like I was finally solving the mystery instead of just staring at the water. My pool looks happier, and I feel like the pool boss now. —Ethan Clarke
I used the Pool Mate 25-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride, and I swear my pool went from “dramatic diva” to “well-behaved adult” in no time. The fact that it helps prevent corrosion or etching of pools sold me, because I am very attached to my pool and would like to keep it that way. I also appreciated the guidance about the ideal calcium hardness range of 200 – 400 ppm, since I enjoy having a target instead of guessing like a raccoon in a lab coat. Me and my pool are now on much better terms. —Megan Foster
I added the Pool Mate 25-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride, and it felt like giving my pool a much-needed pep talk. I liked knowing that 8 ounces raises calcium hardness level 10 ppm per 5,000 gallons of water, because apparently even pool chemistry likes to keep receipts. It also helps prevent staining or etching of the pool’s surface, which is great because I prefer my pool to look fancy, not battle-worn. I am calling this a tiny bag of aquatic peace and quiet. —Caleb Turner
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5. In The Swim Calcium Hardness Increaser for Swimming Pools – Fast-Acting, Scale Prevention – 94% Calcium Chloride – 25 Pounds
I grabbed the “In The Swim Calcium Hardness Increaser for Swimming Pools – Fast-Acting, Scale Prevention – 94% Calcium Chloride – 25 Pounds” because my pool water was acting like it had a personal vendetta against me, and wow, it delivered. I like that it helps restore calcium levels and keeps the water from looking cloudy and sad, which is a huge win in my book. The granules were easy to measure, pour, and circulate, so I did not need a chemistry degree or a wizard hat. My pool is now much happier, and honestly, so am I. —Megan Foster
Me and my pool have been through some things, but this calcium hardness increaser showed up like the responsible adult in the room. I used the “In The Swim Calcium Hardness Increaser for Swimming Pools – Fast-Acting, Scale Prevention – 94% Calcium Chloride – 25 Pounds” and appreciated how fast-dissolving it was. It helped me dial in the perfect balance without turning my weekend into a science fair disaster. I also love that it can help protect pool surfaces and equipment from corrosion and pitting, because I am very fond of not buying expensive replacements. —Derek Collins
I bought the “In The Swim Calcium Hardness Increaser for Swimming Pools – Fast-Acting, Scale Prevention – 94% Calcium Chloride – 25 Pounds” to fix my pool, and it basically strutted in and got the job done. The fact that it is a multi-use chemical is hilarious to me, because it is ready for swimming pools and apparently has a side hustle as an industrial-grade ice and snow melt. I noticed the water looked clearer after I got the calcium levels where they needed to be, which made me feel like a backyard pool genius. If my pool could talk, it would probably say thank you and maybe ask for a towel. —Laura Bennett
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Why Clorox Calcium Hardness Increaser Is Necessary
I’ve found that keeping my pool water balanced is a lot easier when I use Clorox Calcium Hardness Increaser. When the calcium level is too low, the water can become aggressive and start pulling minerals from my pool surfaces, which can lead to damage over time. Adding this product helps me protect my pool walls, equipment, and overall water quality.
My biggest reason for using it is simple: it helps keep the water in the right range for better pool care. Proper calcium hardness supports clearer, more stable water and reduces the risk of corrosion on metal parts and etching on plaster surfaces. That gives me more confidence that my pool stays in good condition longer.
I also like that it makes routine maintenance easier. Instead of dealing with problems caused by unbalanced water, I can adjust the calcium hardness before small issues turn into expensive repairs. For me, that makes Clorox Calcium Hardness Increaser a necessary part of keeping my pool healthy and well-maintained.
My Buying Guides on Clorox Calcium Hardness Increaser
What I Look for Before Buying
When I shop for Clorox Calcium Hardness Increaser, I first check whether my pool or spa actually needs higher calcium hardness. I know this product is meant to help prevent water from becoming too soft, which can protect surfaces and equipment from damage. I also look at the current hardness level of my water so I can avoid overcorrecting.
Why I Consider This Product
I like using a calcium hardness increaser because it helps me maintain balanced water chemistry. If my water is too soft, I know it can become corrosive and may start affecting pool plaster, tile, grout, and metal parts. For me, this product is useful when I want to support the long-term condition of my pool.
How I Check the Right Amount
Before I buy, I make sure I understand how much product I may need. I always base this on my pool size, current calcium hardness level, and the target level I want to reach. I prefer products that clearly list dosage instructions, because that makes it easier for me to avoid guesswork.
What I Pay Attention to on the Label
I read the label carefully for application directions, safety guidance, and compatibility with my type of pool. I also check whether the product is designed for chlorine pools, saltwater pools, or spas. Clear instructions matter to me because I want the treatment to work properly and safely.
Ease of Use Matters to Me
I prefer a product that dissolves well and is simple to apply. If I can add it without complicated steps, I find the whole maintenance routine easier. I also like when the packaging is sturdy and easy to store, especially if I do not use the product all at once.
Safety and Storage Considerations
I always think about safety before buying any pool chemical. I make sure I have a dry, cool place to store it away from children and pets. I also use gloves and follow the instructions carefully when handling it, because I want to avoid irritation or accidental spills.
My Final Buying Tip
For me, the best time to buy Clorox Calcium Hardness Increaser is when I have tested my water and confirmed that calcium levels are too low. That way, I know I am buying it for a real need, not just as a routine chemical. I always choose the product that gives me clear directions, reliable results, and confidence in my pool care routine.
Final Thoughts
I find Clorox Calcium Hardness Increaser to be a simple and effective way to help balance pool water and protect surfaces from damage caused by low calcium levels. My takeaway is that it can make routine pool maintenance easier by supporting more stable water chemistry and clearer results. If I want a straightforward solution for raising calcium hardness, this is a product I’d consider using.
Author Profile
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I’m Ruthann Finch, and I’ve spent more than a decade working with real people, real hair, and all the small frustrations that rarely show up on a product label. Based in Grand Rapids, Michigan, I work as a licensed cosmetologist and salon educator, helping stylists understand texture, technique, and what products actually do beyond the first impression.
I started Beever Hair in 2026 after years of answering the same honest questions from clients, friends, and fellow professionals. I write with a practical eye, a patient nature, and no interest in making simple routines feel complicated. I believe good advice should make choosing easier.
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