Description
SpaGuard Calcium Hardness Increaser - 12 oz
Raise Low Calcium Hardness for Better Spa Water Balance
SpaGuard Calcium Hardness Increaser is a granular spa and hot tub water balancer designed to raise low calcium hardness levels and help protect your spa from the problems caused by water that is too soft. When calcium hardness is too low, spa water can become aggressive, which may contribute to corrosion of equipment, deterioration of surfaces, and damage to plumbing, jets, and fixtures.
This easy-to-use 12 oz treatment helps bring calcium hardness back into the proper range so your spa water stays more balanced, comfortable, and equipment-friendly. It is especially useful after a fresh fill, partial drain and refill, or water test showing low calcium hardness.
Key Benefits
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Raises low calcium hardness: Helps increase calcium levels in spa and hot tub water.
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Helps protect spa equipment: Low calcium hardness can contribute to corrosion of plumbing, jets, fixtures, and equipment.
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Supports surface protection: Helps reduce the risk of surface degradation or etching caused by low calcium hardness.
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Promotes balanced water: Proper calcium hardness is an important part of overall spa water care.
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Granular formula: Easy to measure and apply directly to spa water with the pump running.
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Useful after refills: Ideal for balancing fresh spa water when test results show calcium hardness is too low.
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Supports clearer, more comfortable water: Balanced calcium levels help reduce common water balance issues.
Product Details
Compatibility and Requirements
SpaGuard Calcium Hardness Increaser is made for spas and hot tubs that need higher calcium hardness levels. It is appropriate when water testing shows calcium hardness is below the recommended range for your spa system, surface type, or care program.
For most spa water care routines, follow the calcium hardness target recommended by your spa dealer, water testing system, or product label. Many SpaGuard product directions reference adjusting calcium hardness to maintain 100 to 200 ppm, while some systems such as BioGuard SoftSoak may require a different range.
How to Use SpaGuard Calcium Hardness Increaser
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Test your spa water with an accurate calcium hardness test.
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Determine how much product is needed based on your spa’s water volume and test result.
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With the pump running on high speed, scatter the required amount directly over the spa water.
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Continue circulating the water for 30 minutes.
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Retest and adjust only if needed.
Do not pre-dissolve this product before adding it to the spa, because heat may be generated when it contacts water. Measure carefully, since adding too much can raise calcium hardness higher than intended.
Dosage Guide
Frequently Asked Questions
What does SpaGuard Calcium Hardness Increaser do?
SpaGuard Calcium Hardness Increaser raises calcium hardness in spa and hot tub water. It is used when calcium levels are too low and water needs to be balanced.
Why is low calcium hardness a problem?
Low calcium hardness can make spa water aggressive. Over time, this may contribute to corrosion of equipment, surface deterioration, and wear on plumbing, jets, and fixtures.
When should I use this product?
Use SpaGuard Calcium Hardness Increaser after testing your spa water and confirming that calcium hardness is below the desired range. It is commonly needed after filling or refilling a spa with soft water.
Can I pre-dissolve SpaGuard Calcium Hardness Increaser?
No. Product directions advise against pre-dissolving because heat can be generated when the treatment contacts water. Add it directly to spa water with the pump running.
How much does one tablespoon raise calcium hardness?
One tablespoon per 100 gallons raises calcium hardness by approximately 25 ppm.