HTH Spa Granule pH Plus 2 lb (Pack of 6)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. UPC: 073187861337 Manufacturer Part No: 86133R Increases pH levels in spas and hot tubs Easy to