To raise alkalinity run the pump on high speed and add one ounce for every 10 ppm in a 500 gallon spa. Add as much as required at one time to raise water to the correct alkalinity level. If the pH still needs to be raised once the alkalinity is in range add only 1/2 ounce at a time, then wait 30 minutes, test again and add accordingly, never adding more than 1/2 ounce each time.

*Not compatible with the ThermoEase system*