Clorox® Pool&Spa™ Calcium Hardness Increaser for Safe Pool Equipment Protection, Non-Corrosive Water Balancer for Plaster Pools
Clorox® Pool&Spa™ Calcium Hardness Increaser for Safe Pool Equipment Protection, Non-Corrosive Water Balancer for Plaster Pools
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Why you'll love it
- Trusted Clorox brand credibility in water care provides confidence over generic alternatives
- Prevents expensive damage to pool surfaces, heaters, and metal fittings from corrosive low-hardness water
- Companion Clorox Pool App delivers personalized dosage and testing guidance for accurate treatment
- Granular formula is easy to measure and broadcast directly into the pool without pre-mixing
- Specifically formulated to be effective in soft water regions where calcium deficiency is a chronic issue
- Multi-pack (3-pack) option reduces cost per treatment and minimizes reordering frequency
Perfect for
- Raising low calcium hardness levels in pool water after refill or seasonal opening
- Preventing corrosion of metal pool equipment, heaters, and ladders caused by soft water
- Stopping etching and staining on plaster pool surfaces and tile
- Routine water balancing maintenance to extend pool surface and equipment lifespan
- Restoring water chemistry in plaster pools located in soft-water geographic areas
For Beautiful, Comfortable Water
Balanced pool water prevents skin and eye irritation, and extends the life of equipment by protecting surfaces from corrosion, scale and stains. Balancers help to restore water parameters to their ideal ranges.
Preserves Pool & Equipment
Protects pool equipment and surfaces from the effects of unbalanced water.
Protects Surfaces
Prevents corrosion, etching and staining.
Test Weekly
Your pool chemistry can change quickly. Test your pool water weekly to ensure your chlorine and pH remain within optimal swimming levels.
Brush & Clean
Brush, vacuum and skim water surface weekly to remove dirt and debris.
Balance Water
Ensure your water parameters are balanced to their ideal ranges for optimal swimmer comfort and surface and eqipment protection.
Product Information
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.
Clorox Pool&Spa Swimming Pool Calcium Hardness Increaser, Prevents Corrosion, Etching and Staining, 4LB (Pack of 1);12204CLX.Global Trade Identification Number: 00810821023108
Number of Items: 1
Item Type Name: Calcium Hardness Increaser, 4 lb.
Included Components: Includes: 1 x Pool&Spa 12204CLX Calcium Hardness Increaser, 4 lb
Item Form: Granular
Product Benefits: Staining Prevents,Corrosion,Prevents Corrosion
Item Weight: 4 pounds
Frequently Asked Questions
How does raising calcium hardness actually protect my pool equipment from corrosion?
When calcium hardness is too low, water becomes aggressive and leaches minerals from metal components like heaters, ladders, and fittings. Raising hardness to the recommended range makes the water balanced and non-corrosive, extending equipment life and preventing costly replacements.
Is this product safe to handle around children and pets during routine pool maintenance?
When used as directed and stored in its original sealed container, the granular formula is safe for residential use around kids and pets. Always follow Clorox Pool App dosage instructions and keep the container closed and out of reach when not in use.
Will this calcium increaser damage my pool heater if my hardness levels are already borderline?
No, when dosed according to your test results via the Clorox Pool App, it brings hardness into the ideal balanced range without overshooting. Proper testing before each application prevents any risk to the heater or other equipment.
Can I use this to prevent etching on my plaster pool surface before it becomes a safety concern?
Yes, raising calcium hardness stops the chemical process that causes etching and staining on plaster and tile. Early treatment prevents the surface degradation that can create rough spots and sharp edges in the pool.
Does the Clorox brand name on this product mean I can trust it for safe, balanced water chemistry?
Yes, Clorox Pool and Spa is a trusted name in pool water care with established quality standards. The brand credibility provides confidence that you are using a reliably formulated product rather than an unverified generic alternative.
Is this safe to use in a pool where my kids swim every day?
Yes, once the granular calcium chloride is fully dissolved and circulated through the pool water, it is safe for routine swimming. The Clorox Pool App provides dosage guidance so you reach the proper hardness level without overcorrection.
Will adding this product eliminate the need to replace corroded metal pool components?
In many cases, yes. By stopping ongoing corrosion from low-hardness water, this increaser prevents the conditions that damage heaters, ladders, and fittings, often eliminating the need for premature equipment replacement.
Is this product safer for my pool plaster than muriatic acid-based hardness adjusters?
Yes, calcium chloride increaser is a much safer and more targeted way to raise hardness than attempting to adjust with acid-based products, which can lower pH unpredictably and create new water balance problems.
How does Clorox calcium increaser compare to generic calcium chloride from a hardware store?
It offers Clorox brand quality control, companion app integration for accurate dosing, and formulation testing specifically for soft water region pool use, whereas generic products may vary in purity and offer no dosing support.
How does this compare to using a pool calcium supplement versus ignoring the problem?
Ignoring low hardness leads to corrosion, etching, and staining that costs hundreds to thousands in equipment and surface repairs. The calcium supplement is a low-cost preventive measure that avoids those expensive outcomes.
I'm worried this will raise my pH and throw off the rest of my water chemistry. Is that a real risk?
Calcium chloride has a near-neutral effect on pH when dosed properly, so it should not significantly shift your pH balance. The Clorox Pool App helps you verify all parameters after treatment to confirm balanced water.
What if I accidentally add too much? Can it damage my pool surface?
Excessively high hardness can cause calcium scaling on plaster and tile. Always test current hardness before adding the product and follow the Clorox Pool App dosage for your specific pool size to avoid overcorrection.
Is it worth the cost compared to just refilling the pool when water gets aggressive?
No, frequent draining and refilling wastes water and money. A single calcium hardness treatment is far more cost-effective than repeated refills, and it preserves your plaster surface and equipment throughout the season.
How do I add calcium hardness increaser to my pool step by step?
First, test your current calcium hardness level with a reliable test kit. Calculate the dosage needed using the Clorox Pool App based on your pool size and current reading. Broadcast the granular product evenly across the pool surface with the pump running, then allow 4 to 6 hours of circulation. Retest to confirm the level is in the ideal range of 200 to 400 ppm.
How often should I test and add calcium hardness to maintain balanced water?
Test calcium hardness at the start of the season, after each refill, and monthly during the swim season. In soft water regions, evaporation and refill cycles can drop hardness quickly, so more frequent testing may be needed. The Clorox Pool App can send reminders and adjust dosage recommendations based on your readings.
Can I apply calcium increaser at the same time as other pool chemicals?
It is best to add calcium increaser separately from other treatments and allow it to fully circulate and dissolve before adding additional chemicals. Always follow the Clorox Pool App sequencing guidance and test all parameters between treatments to avoid unwanted chemical interactions.
Is this product compatible with salt water chlorine generators?
Yes, calcium chloride increaser is fully compatible with salt water pool systems, plaster finishes, vinyl liners, and standard chlorine or bromine sanitation. The Clorox Pool App can confirm compatibility with your specific setup and equipment.
Does this work with all pool sizes from small spas to large commercial pools?
Yes, the granular formula scales by dose. For small spas, hot tubs, and above-ground pools, a small portion of the 4-pound bag is sufficient. For large commercial or resort pools, the 3-pack provides enough product to treat full-volume water with multiple follow-up doses as needed.
What exactly comes in the box when I order this product?
You receive one or three 4-pound containers of Clorox Pool and Spa Swimming Pool Calcium Hardness Increaser in granular form, each in a sealed, labeled container with usage instructions. You will need a calcium hardness test kit, which is sold separately, and a compatible smartphone to access the Clorox Pool App for personalized dosage guidance.
Is calcium chloride safe to use around landscaping and grass near the pool?
When broadcast directly into the pool water and not onto surrounding lawn or plants, calcium chloride is safe for typical residential landscaping. Avoid letting undissolved granules sit on grass or garden beds, as concentrated salt can cause localized burn spots on sensitive vegetation.
How long does it take to see results after adding calcium hardness increaser?
Most pools reach fully balanced hardness within 4 to 6 hours of circulation after application, though the Clorox Pool App recommends retesting at 24 hours to confirm a stable reading and to verify that pH, alkalinity, and hardness are all in their ideal ranges.
What is the difference between calcium hardness increaser and a general pool water balancer?
Calcium hardness increaser is specifically formulated to raise only the calcium hardness parameter, addressing soft or aggressive water. General pool balancers often adjust pH, alkalinity, or sanitizer levels but do not reliably raise calcium hardness, making this product a targeted solution for low-hardness conditions in soft water regions.
