FROG DropH pH and Total Alkalinity Decreaser for Hot Tubs and Swim Spas - 3 lb Bottle with TruDose Measuring Cap for Easy Maintenance & Balancing - 1 PackBrand: FROG Features: Fast Dissolving pH and Alkalinity Down: Decrease and balance the pH and total alkalinity level in your hot tub or swim spa to improve water clarity and sanitizer effectiveness; prevent corrosion and reduce skin and eye irritation by balancing your pH between 7. 2 and 7. 8 ppm Skip the Guesswork: FROG TruDose Cap seals the bottle securely to prevent spills and features standard cup and tablespoon indicators; translucent measuring