About This Item HTH Spa pH Up helps balance pH levels in your spa water, improving both water quality and comfort. pH Up not only ensures that your sanitizer is working more efficiently, but it helps prevent corrosion of spa surfaces as well as significantly reduces skin and eye irritation. HTH Spa pH Up is great for all spa types including bromine, chlorine and biguanide. How To Use HTH Spa pH Up Use HTH Spa Test Strips to test your spa water. If pH measures below 7.2 ppm, add HTH Spa pH Up directly to the filter skimmer with the spa circulation system running. Refer to the on-pack chart for the correct dosage. After the spa circulation system has been running for 30 minutes, re-test pH and add more pH Up if necessary. Test and balance your spa water twice a week to maintain pH levels between 7.2 and 7.8 ppm. About HTH Spa 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.