Balancing Total Alkalinity

Keeping the Total Alkalinity (TA) balanced helps maintain proper pH, prevents damage to equipment, especially the heater, keeps the water clear, and prevents scale buildup. In chlorinated or brominated spas, the alkalinity should be maintained from approximately 80 to 120 ppm. Levels above this will not necessarily cause problems, but other factors should be taken into account, such as the Calcium Hardness, average temperature, and pH.

Total alkalinity is lowered by the use of Brominating Tablets and regular use of Spa Shock, so it is important to test it periodically and adjust as needed. Test total alkalinity at least once every three to four weeks, depending on the amount of use the spa is getting.

If the total alkalinity is high, use a pH Decreaser to gradually lower it over a period of days. Make sure aeration is off when you are adding pH Decreaser.

If the total alkalinity is low, use a Total Alkalinity Increaser according to label instructions or dealer recommendations.

Note: This information is intended for a residential spa with average use.  It is not designed for public, commercial, or semi-public spas.  If your hot tub is used more than three times per week, you should check and make chemical additions more often than suggested.