SpaGuard Spa Sentry (1 quart)

Spa Sentry (1 quart).

• Phosphate buffer
• Easy, one step liquid
• Helps maintain proper pH
• Softens water by removing calcium
• Not for use in plaster or tile-surface spas
• Not for use in Soft Soak® spas

Easiest way to control pH. Expect up to two months of clear, pH stable water.