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HTH Spa Care pH Down, Lowers pH, Prevents Scale, 2.5 lbs HTH® Spa pH Down helps balance pH levels in your spa water, improving both water quality and comfort. pH Down not only ensures that your sanitizer is working more efficiently, but it helps prevent scaling of spa surfaces as well as significantly reduces skin and eye . HTH® Spa pH Down is great for all spa types including bromine, chlorine and biguanide. How To Use HTH® Spa pH Down Use HTH® Spa Test Strips to test your spa water. If pH measures above 7.8 ppm, add HTH® Spa pH Down directly to the filter skimmer with the spa circulation system running. After the spa circulation system has been running for 30 minutes, re-test pH and add more pH Down if necessary. Test and balance your spa water twice a week to maintain pH levels between 7.2 and 7.8 ppm. * Decreases the pH levels in spas and hot tubs * Allows sanitizer to work more effectively * Prevents scaling of spa surfaces and equipment * Contains mineral crystals * Compatible with all spas About HTH® Spa Care For generations, HTH® has been leading the way in smart spa care. We do the chemistry so you can just take it easy. From the very first day you open your spa, HTH® is here to help maintain and problem solve. Our complete range of simple-to-use, no-nonsense products empower you to balance, sanitize and treat your spa—it’s everything you need and nothing you don't. There is nothing more relaxing than taking it easy in sparkling, clean water. With HTH®, your spa is always ready when you are. Contains mineral crystals HTH® Spa pH Down is formulated to provide a more relaxing spa experience. Compatible with all spas HTH® Spa pH Down is great for all spas, including bromine, chlorine and biguanide. You're all clear with HTH® For best results, use HTH® Spa Test Strips twice a week to test, balance and maintain total pH levels between 7.2 and 7.8 ppm.