SpaGuard Rapid Dissolve pH Decreaser Tablets for Spas and Swim Spas

Experience a lower pH with ease using these 1 inch compressed tabs for your spa or swim spa! Simply add 1 tab per 250 gallons to the filter compartment while the pump is running, and within minutes, watch as the tablets dissolve completely. While it's fun to drop these in the footwell, it's not recommended. Watch as your pH and total alkalinity levels drop in a flash. Retesting recommended after 4 hours.