Hot Tub Things® Calcium Increaser – 32 oz Spa Hardening Booster
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Why Shop With Hot Tub Things?
Authentic & Genuine Products
Shop trusted inventory of original spa parts.
Competitive Pricing
Built value for genuine spa care.
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Strong fit and quality without overpaying.
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Supported by our easy return process.
Key Features & Benefits
Fast-Acting Formula
Our calcium increaser dissolves rapidly, raising calcium hardness levels quickly without clouding your water. No waiting days for results—just add, circulate, and test.
Professional-Grade Quality
Engineered for seamless compatibility with original mounting points for secure placement.Formulated to the same standards used by spa service professionals. Pure calcium chloride ensures consistent, reliable results every time.
Prevents Equipment Damage
Low calcium hardness creates corrosive water that can etch spa surfaces, damage heaters, and corrode metal components. Regular use of our spa hardness booster protects your equipment and extends the life of your hot tub.
Easy to Use
Simply measure your current calcium hardness with test strips, calculate the amount needed, and add directly to your spa water while the jets are running. Detailed instructions included.
Compatible with All Sanitizers
Works seamlessly with chlorine, bromine, saltwater systems, and mineral sanitizers. No conflicts with your existing water care routine.
Ideal Calcium Range
Maintains optimal calcium hardness between 150-250 ppm (parts per million) for balanced, non-corrosive water that feels great and protects your spa.
Product Overview
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La fórmula líquida de precisión aumenta la dureza del calcio del agua del spa de manera eficiente, lo que ayuda a prevenir el agua corrosiva “hambrienta” que puede dañar los calentadores, las tuberías y las piezas metálicas.
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Ideal para uso semanal o para rellenos frescos en spas con agua baja o suavizada, restableciendo el equilibrio sin sobrepasar los niveles que generan sarro.
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Ayuda a minimizar la espuma, la turbidez y la demanda de desinfectante al mantener una dureza estable, esencial para una eficacia óptima del desinfectante.
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Compatible con todos los tipos de desinfectantes para jacuzzis, incluidos los sistemas de cloro, bromo, agua salada y minerales, lo que simplifica su rutina química.
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Una práctica botella de 32 oz con líneas de dosificación marcadas permite agregar fácilmente cantidades precisas según el volumen del spa.
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Con el respaldo de la garantía de calidad de Hot Tub Things, probado de manera segura para uso en spa y formulado sin rellenos agresivos, en el que confían profesionales y aficionados al bricolaje.
Frequently Asked Questions
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Test your calcium hardness monthly. Most hot tubs need calcium increaser added every 2-4 months, depending on water source, evaporation, and refill frequency. If you use soft water or frequently drain and refill your spa, you may need to add it more often.
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Low calcium hardness (below 150 ppm) creates corrosive water that can etch plaster, damage acrylic surfaces, corrode heaters and pumps, and cause foaming. It can also make water feel "soft" or slippery and reduce the effectiveness of sanitizers.
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As a general rule, add 1 ounce of calcium increaser per 100 gallons of water to raise calcium hardness by approximately 7 ppm. Always test first, calculate your needs, and add gradually while circulating water.
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Yes! Hot Tub Things® Calcium Increaser works perfectly with saltwater systems, chlorine, bromine, and all other sanitizer types. It won't interfere with your salt cell or water chemistry.
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Absolutely. While formulated for hot tubs and spas, this calcium increaser is also suitable for swim spas, plunge pools, and small above-ground pools.
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They're the same product. "Calcium increaser," "calcium hardness increaser," and "spa hardness booster" all refer to calcium chloride products designed to raise calcium levels in spa water.
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