The H4947 Spa Essentials Calcium Hardness Increaser 350g is a granular water balancing treatment designed to maintain proper calcium hardness levels in hot tubs and spas. Keeping calcium levels within the ideal range of 150–200 ppm helps protect your spa equipment, prevent surface damage, and maintain clear, balanced water.
⚠ Please Note: Production of this product has currently been suspended by the manufacturer. Availability and restock timing are unknown.
Why Calcium Hardness Matters in Your Spa
Calcium hardness is a critical component of balanced spa water chemistry. When levels are too low, water becomes aggressive and may cause:
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Corrosion of heaters and metal components
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Etching of spa surfaces
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Premature equipment wear
When levels are too high, it can lead to:
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Scale buildup
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Cloudy water
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Staining on surfaces
Maintaining the recommended 150–200 ppm calcium hardness range helps ensure long-term protection and optimal performance of your hot tub system.
Key Features & Benefits
✔ Raises calcium hardness levels effectively
✔ Helps prevent corrosion and equipment damage
✔ Reduces risk of scale and cloudy water
✔ Granular formula for easy application
✔ Ideal for routine spa water balancing
Best Practice for Use
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Test spa water using reliable test strips or liquid test kits.
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Confirm calcium hardness is below the recommended 150–200 ppm range.
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Add the recommended dosage according to your spa’s water volume.
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Allow water to circulate fully before retesting.
Regular water testing and balanced calcium levels extend the life of your hot tub components and improve overall water clarity.
