Why Choose Hot Tub Things?
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Competitive Pricing: Best value for premium spa care products
Expert Customer Support: Our team knows hot tubs inside and out
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Available in stock (2036)
Hot Tub Things® pH & Alkalinity Down – Granular Spa Water Reducer
Hot Tub Things® pH & Alkalinity Down is a concentrated granular acid formula designed specifically for hot tubs and spas. When your water's pH or alkalinity levels rise too high, this product brings them back into the ideal range, protecting your equipment and ensuring optimal water quality.
Maintaining proper pH balance (7.2-7.8) and total alkalinity (80-120 ppm) is essential for hot tub health. High pH levels make sanitizers less effective, cause cloudy water, promote scale buildup on surfaces and equipment, and can irritate skin and eyes. Our pH Down formula corrects these issues quickly, restoring balance to your spa water.
Unlike liquid acids that can be hazardous to handle and store, our granular formula is safer, easier to measure, and more convenient to use. The fast-dissolving granules work immediately upon contact with water, providing rapid pH correction when you need it most.
Understanding pH & Alkalinity
What is pH? pH measures how acidic or basic your water is on a scale of 0-14. The ideal range for hot tubs is 7.2-7.8, which is slightly alkaline and comfortable for bathers while allowing sanitizers to work effectively.
What is Total Alkalinity? Total alkalinity acts as a pH buffer, preventing rapid pH swings. Proper alkalinity (80-120 ppm) stabilizes pH and makes water chemistry easier to maintain. Always adjust alkalinity before adjusting pH.
Why Does pH Rise? Common causes include: aeration from jets and waterfalls, high alkalinity, addition of alkaline chemicals, evaporation, and bather load. Regular testing and adjustment keep pH in check.