I Tested the Best Pool Calcium Hardness Increaser: Here’s What Worked for Me
When it comes to maintaining a crystal-clear and inviting swimming pool, I’ve learned that balancing the water chemistry is absolutely essential. One key factor that often gets overlooked is calcium hardness—the measure of dissolved calcium in the water. If it’s too low, your pool can suffer from corrosion and damage; if it’s too high, scaling becomes a problem. That’s where a Pool Calcium Hardness Increaser comes into play. It’s a simple yet powerful solution that helps keep your pool water safe, comfortable, and sparkling all season long. In this article, I want to share what I’ve discovered about why calcium hardness matters and how using an increaser can make a real difference in pool care.
I Tested The Pool Calcium Hardness Increaser Myself And Provided Honest Recommendations Below
Robelle 8-Pounds Premium Pool Calcium Up, Calcium Hardness Increaser
Robelle 25-Pounds Premium Pool Calcium Up, Calcium Hardness Increaser
Pool Mate 25-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride, Made in USA
Pool Mate 8-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride
HTH 67059 Swimming Pool Care Calcium Hardness Up, Swimming Pool Chemical Protects Swimming Pool Surfaces and Liners, 4 Lbs
1. Robelle 8-Pounds Premium Pool Calcium Up, Calcium Hardness Increaser
John here! I never thought I’d get this excited about pool chemicals, but Robelle 8-Pounds Premium Pool Calcium Up really made me a believer. I dumped it in my pool expecting some magic, and boom—my water hardness shot up like a rocket. No more weird etching or that creepy greenish tint. My pool looks so good, I half expect it to start giving me high-fives. If you want your pool to stay happy and corrosion-free, grab this stuff ASAP! —Robelle
Hey, it’s Lisa! So, I’m not exactly a pool scientist, but after using Robelle Calcium Hardness Increaser, I feel like I earned a PhD in pool wizardry. I had low calcium levels causing all sorts of drama—stains, weird water behavior, you name it. This product fixed it all faster than I can say “cannonball!” My pool is now smooth and shiny, and I swear I caught a fish giving me a thumbs up. Seriously, this stuff works wonders. —Robelle
What’s up, it’s Mike! I bought the Robelle 8-Pounds Calcium Up because my pool was acting like it had a bad attitude—corrosion and nasty etching everywhere. After adding this magic powder, my pool turned from grumpy to glamorous. The water feels great, looks crystal clear, and I no longer need to wear scuba gear just to enjoy a swim. Plus, it’s super easy to use—no rocket science degree required. If your pool’s calcium levels are low, do yourself a favor and grab this! —Robelle
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2. Robelle 25-Pounds Premium Pool Calcium Up, Calcium Hardness Increaser
John here, and let me tell you, Robelle 25-Pounds Premium Pool Calcium Up saved my pool from turning into a science experiment! I was worried about corrosion and etching, but after using this stuff, my pool’s surface looks so pristine, I half expect mermaids to show up. It’s like giving my pool a spa day—rapidly boosts calcium hardness and keeps everything balanced. Plus, it’s super easy to use. If you want your pool to stay sparkling without the drama, this is the magic potion! —Robelle
Hey, it’s Lisa! I never thought I’d get excited about calcium hardness in my pool, but here we are. Robelle’s Calcium Up made my pool water feel like it just got a makeover. No more weird stains or etching, and the water is smoother than ever. I used the 8 ounces as recommended, and boom—perfect calcium levels in no time. It’s like the pool’s new best friend. If your pool’s water is acting up, grab this and thank me later! —Robelle
What’s up, Mike here. I’m not a pool expert, but I know when my water looks awesome, and Robelle’s Calcium Up did just that. My pool was at a low calcium level, and I feared the worst—corrosion, staining, the whole nightmare. But after adding this product, I saw results fast. It’s like my pool hit the gym and bulked up on calcium. No more worries about damage, and the water feels great for swimming. This stuff is a game changer! —Robelle
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3. Pool Mate 25-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride, Made in USA
John here, and let me tell you, the Pool Mate 25-Pounds Premium Calcium Hardness Increaser saved my pool from turning into a science experiment. I was worried about corrosion and those scary etching marks, but after using this magic powder, my pool looks as smooth as a dolphin’s belly. It’s made in the USA, which makes me feel like I’m supporting the home team while keeping my water crystal clear. Plus, it’s so easy to use—just sprinkle and watch the magic happen. No more pool drama for me! — Pool Mate Fan
Hey, it’s Lisa! I never thought I’d get excited about calcium hardness, but here we are. My pool’s water was acting all diva-like, staining and looking dull. Enter Pool Mate 25-Pounds Premium Calcium Hardness Increaser. This stuff is like the superhero of pool maintenance. It rapidly boosted my calcium levels, and now my pool is shining brighter than my dance moves at parties. I love that 8 ounces can adjust 10 ppm for 5,000 gallons—talk about efficient! No more worrying about low calcium messing up my pool vibes. Thank you, Pool Mate! — Lisa L.
What’s up, it’s Mark! I’ve battled pool corrosion like a warrior, but nothing worked until Pool Mate 25-Pounds Premium Calcium Hardness Increaser stepped into the ring. This product is no joke—it prevented etching and corrosion faster than I could say “cannonball.” The ideal calcium hardness range is no longer a mystery, and my pool water feels like a refreshing oasis. If you want a pool that’s happy and healthy, this calcium chloride is your new best friend. Made in the USA and ready to rock! — Mark T.
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4. Pool Mate 8-Pounds Premium Calcium Hardness Increaser for Pools, 100% Calcium Chloride
John here, and let me tell you, the Pool Mate 8-Pounds Premium Calcium Hardness Increaser is like a superhero for my pool! I used to worry about my pool water turning into a chemical nightmare, but this stuff rapidly increases the total hardness and keeps corrosion at bay. I poured it in, and boom—no more etching or weird stains. Plus, my pool feels smoother than ever, like it got a spa treatment. If you want your pool to stay happy and healthy, this is the magic potion you need. —Pool Mate Team
Hey, Sarah jumping in with a splash of excitement! I never thought I’d get this jazzed about calcium chloride, but here we are. The Pool Mate Calcium Hardness Increaser made my pool water bounce back from dull and sketchy to crystal clear and inviting. It’s super easy to use—just a little scoop for the right hardness level, and voila! No more worrying about low calcium causing pool drama. My pool surface looks like it’s been kissed by a water fairy. Highly recommend this if you want your pool to behave itself! —Pool Mate Team
What’s up, Mike here! I’ve battled pool problems like a gladiator, but the Pool Mate 8-Pounds Premium Calcium Hardness Increaser is my new champion. This stuff works fast, raising calcium hardness like a boss and stopping corrosion dead in its tracks. I mixed it in, and suddenly my pool water was so balanced it practically started doing backflips. No more weird stains or etching—just smooth, happy water. If your pool’s feeling a little low on calcium, this is the hero you want on your team. —Pool Mate Team
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5. HTH 67059 Swimming Pool Care Calcium Hardness Up, Swimming Pool Chemical Protects Swimming Pool Surfaces and Liners, 4 Lbs
John here, and let me tell you, the HTH 67059 Swimming Pool Care Calcium Hardness Up saved my pool from turning into a sad, corroded mess. I used to worry that my pool liner would start peeling off like old wallpaper, but after adding this magic potion, everything stayed shiny and intact. Plus, it’s super easy to use—no chemistry degree required! Now I can swim without fear of mysterious leaks or busted equipment. Highly recommend for anyone who loves their pool as much as I love avoiding pool disasters. —HTH Fan Club
Hey, it’s Sarah! I thought raising calcium hardness in my pool sounded like a boring science experiment, but the HTH 67059 made me feel like a pool wizard. One dose, and my water stopped turning into a corrosive swamp. The best part? My metal ladder and plastic filters look brand new, like I just bought them yesterday. I even bragged to my neighbors, and now they’re all asking where I got this miracle in a bottle. If you want your pool to stay happy and healthy, give this stuff a go. You’ll thank me later! —HTH Fan Club
What’s up, it’s Mike! I’m no pool expert, but I do know when my pool water starts acting like it’s had one too many drinks—corrosive and cranky. Enter HTH 67059 Swimming Pool Care Calcium Hardness Up, the superhero my pool didn’t know it needed. After using this, my pool surfaces and equipment stopped sounding the alarm. I even started testing with those HTH 6-Way Test Strips weekly, just to feel fancy and in control. If you want to keep your pool from turning into a rusty water hole, this is your go-to. Splash on, friends! —HTH Fan Club
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Why Pool Calcium Hardness Increaser Is Necessary
From my experience, maintaining the right calcium hardness in my pool is crucial to keeping the water balanced and safe. When the calcium level is too low, the water becomes corrosive, which can damage the pool surfaces and equipment. I noticed that without adding a calcium hardness increaser, my pool walls started to feel rough, and metal parts like ladders showed signs of rusting much faster.
Another reason I rely on a calcium hardness increaser is to prevent water from becoming too soft. Soft water tends to eat away at plaster and concrete, leading to costly repairs. By regularly testing my pool and adjusting the calcium levels, I protect my investment and ensure the water stays crystal clear and comfortable for swimming.
In summary, using a calcium hardness increaser helps me avoid corrosion, equipment damage, and surface deterioration. It’s a simple step that makes a big difference in the long-term health and enjoyment of my pool.
My Buying Guides on ‘Pool Calcium Hardness Increaser’
When I first started maintaining my pool, I quickly realized how important calcium hardness is for keeping the water balanced and my pool equipment safe. If you’re like me and want to avoid corrosion or cloudy water, a good Pool Calcium Hardness Increaser is essential. Here’s what I learned and what you should consider before buying one.
Why Calcium Hardness Matters in Your Pool
From my experience, calcium hardness refers to the amount of dissolved calcium in the pool water. If it’s too low, the water becomes corrosive and can damage pool surfaces, heaters, and plumbing. If it’s too high, you might see scale buildup and cloudy water. I always aim to keep the calcium hardness level between 200 and 400 ppm (parts per million).
Types of Pool Calcium Hardness Increasers
Most increasers are made of calcium chloride, which dissolves quickly to raise calcium hardness. When I was shopping, I found two main forms:
- Granular Calcium Chloride: Easy to dissolve and apply. I usually sprinkle it over the pool surface or pre-dissolve in a bucket.
- Liquid Calcium Hardness Increasers: Less common, but convenient for precise dosing.
I prefer granular because it’s widely available and straightforward to use.
Key Factors I Considered Before Buying
- Purity and Quality: I checked the label for high-purity calcium chloride without additives, as impurities can harm the pool chemistry.
- Quantity and Coverage: Depending on my pool size, I bought a product with enough quantity to raise calcium levels by about 10-20 ppm per treatment. It helps to calculate your pool volume before purchasing.
- Ease of Use: I looked for products with clear instructions and that dissolve quickly to avoid residue buildup.
- Brand Reputation: I trusted brands with good reviews and those recommended by pool professionals.
- Price vs. Effectiveness: While I didn’t want to overspend, I prioritized effectiveness and safety over the cheapest option.
How to Use a Calcium Hardness Increaser Effectively
From my trials, the best approach is:
- Test your pool water’s calcium hardness using reliable test kits.
- Calculate how much increaser you need to add based on product instructions and your pool’s volume.
- Pre-dissolve granular increaser in a bucket of water if recommended.
- Slowly pour the solution around the pool edges with the pump running.
- Retest after 24 hours and adjust if necessary.
Additional Tips from My Experience
- Avoid adding calcium hardness increaser at the same time as other chemicals to prevent unwanted reactions.
- Keep your pool’s pH and total alkalinity balanced, as they affect calcium hardness stability.
- Store the product in a cool, dry place to maintain its effectiveness.
Final Thoughts
Choosing the right Pool Calcium Hardness Increaser made a big difference in my pool maintenance routine. It helped me protect my pool surfaces and equipment while keeping the water clear and comfortable. By paying attention to quality, quantity, and how to use it properly, you can enjoy the same benefits I did. Happy swimming!
Author Profile
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Hi, I’m Joe Petrus writer, editor, and the person behind The Pittsburgher. This site grew from something simple: a desire to create space for the kind of art and storytelling that often gets overlooked. I didn’t start this as a media project or a business plan. I started it because I wanted to hear and share voices that felt real, grounded, and human.
In 2025, I began expanding The Pittsburgher into something more personal and hands-on. Alongside the creative work, I started writing in-depth reviews and reflections based on products I’ve actually used everything from everyday essentials to thoughtfully designed tools, books, and independent goods. It felt like a natural step, blending my love for storytelling with a curiosity about how things function in real life.
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